Class 10 Science Chapter 2 MCQ Questions

Acids Bases And Salts Class 10 Science Chapter 2 MCQ Questions are available here. The MCQ questions are created by subject experts of our website CBSE Wale. I hope you will like these MCQ questions. You can take a screenshot of the Answers key in a separate window or tab to get easy access to the answers. 

Acids Bases And Salts Class 10 Science Chapter 2 MCQ Questions

Question 1: What causes sour and bitter tastes in food?

A) Acids and bases

B) Sugars and proteins

C) Salt and spices

D) Water and minerals

Question 2: Which of the following can be used as a remedy for acidity after overeating?

A) Lemon juice

B) Milkshake

C) Chocolate

D) Coffee

Question 3: How can sour and bitter substances be tested without tasting them?

A) By touching them

B) By using litmus and turmeric as indicators

C) By observing their texture

D) By measuring their temperature

Question 4: What happens to blue litmus paper when it comes in contact with an acid?

A) It turns red

B) It turns blue

C) It turns purple

D) It does not change colour

Question 5: Which of the following substances can change the colour of curry stains on white cloth from reddish-brown to yellow?

A) Vinegar

B) Baking soda

C) Lemon juice

D) Soap

Question 6: What can be used to test for acids and bases besides litmus paper?

A) Methyl orange and phenolphthalein

B) Salt and sugar

C) Vinegar and oil

D) Water and air

Question 7: What is the litmus solution commonly used for?

A) Cleaning stains

B) Cooking food

C) Measuring temperature

D) Acting as an indicator

Question 8: What will be the colour of the litmus solution when it is neither acidic nor basic?

A) Red

B) Blue

C) Purple

D) Yellow

Question 9: Besides litmus, what are some other natural materials that can indicate the presence of acid or base in a solution?

A) Red cabbage leaves, turmeric, and coloured petals of flowers

B) Coffee beans, tea leaves, and cocoa powder

C) Salt crystals, sugar cubes, and lemon zest

D) Wheat flour, cornstarch, and baking powder

Question 10: What are olfactory indicators?

A) Substances that change their odour in acidic or basic environments

B) Substances that change their colour in acidic or basic environments

C) Substances that change their taste in acidic or basic environments

D) Substances that change their texture in acidic or basic environments

Question 11: Which of the following is an example of an olfactory indicator?

A) Salt

B) Sugar

C) Vanilla

D) Water

Question 12: Which of the following is NOT an olfactory indicator?

A) Vanilla

B) Onion

C) Clove

D) Salt

Question 13: What happens to the smell of vanilla, onion, and clove when they are mixed with an acidic solution?

A) The smell changes

B) The smell disappears

C) The smell becomes stronger

D) The smell remains the same

Question 14: What happens to the smell of vanilla, onion, and clove when they are mixed with a basic solution?

A) The smell changes

B) The smell disappears

C) The smell becomes stronger

D) The smell remains the same

Question 15: Which chemical equation represents the reaction between dilute sulphuric acid and zinc?

A) H2SO₄ + Zn → ZnSO₄ + H2

B) H2 + ZnSO₄ → H2SO₄ + Zn

C) Zn + H2SO₄ → ZnSO₄ + H2

D) ZnSO₄ + H2 → H2SO₄ + Zn

Question 16: What is the product formed when zinc reacts with sulphuric acid?

A) Sodium hydroxide

B) Zinc oxide

C) Zinc sulphate

D) Hydrogen peroxide

Question 17: What is the result of the reaction between a metal and an acid?

A) Formation of a salt

B) Formation of a gas

C) Formation of a metal oxide

D) Formation of water

Question 18: Which compound is formed as a product in the reaction between sodium hydroxide and zinc?

A) NaOH

B) ZnO

C) Na₂ZnO₂

D) H2

Question 19: What is the general equation for the reaction of a metal with an acid?

A) Acid + Metal → Salt + Water

B) Acid + Metal → Salt + Oxygen

C) Acid + Metal → Salt + Hydrogen gas

D) Acid + Metal → Salt + Carbon dioxide

Question 20: Why do all metals not react with acids to produce hydrogen gas?

A) They do not contain hydrogen atoms.

B) They do not form salts.

C) They have a lower reactivity.

D) They are not soluble in acids.

Question 21: What determines the reactivity of metals with acids?

A) Their atomic mass

B) Their colour

C) Their position in the reactivity series

D) Their density

Question 22: What is the general equation for the reaction between a metal carbonate and an acid?

A) Metal carbonate + Acid → Salt + Carbon dioxide + Water

B) Metal carbonate + Acid → Salt + Oxygen + Water

C) Metal carbonate + Acid → Salt + Hydrogen gas + Water

D) Metal carbonate + Acid → Salt + Carbon monoxide + Water

Question 23: Which of the following equations represents the reaction between sodium carbonate and hydrochloric acid?

A) Na₂CO₃ + 2HCl(aq) → 2NaCl(aq) + H₂O(l) + CO₂(g)

B) Na₂CO₃ + HCl(aq) → NaCl(aq) + H₂O(l) + CO₂(g)

C) NaHCO₃ + 2HCl(aq) → 2NaCl(aq) + H₂O(l) + CO₂(g)

D) NaHCO₃ + HCl(aq) → NaCl(aq) + H₂O(l) + CO₂(g)

Question 24: What happens when carbon dioxide gas evolved from the reaction is passed through lime water?

A) Lime water turns blue

B) Lime water turns red

C) Lime water forms a white precipitate

D) Lime water remains clear

Question 25: What is the white precipitate formed when carbon dioxide reacts with lime water?

A) Sodium chloride

B) Sodium bicarbonate

C) Calcium carbonate

D) Calcium hydroxide

Question 26: What is the product formed when carbon dioxide dissolves in water?

A) Carbon monoxide

B) Carbonic acid

C) Sodium bicarbonate

D) Sodium chloride

Question 27: What happens when excess carbon dioxide is passed through the solution containing calcium carbonate?

A) Calcium carbonate precipitates

B) Calcium hydroxide forms

C) Calcium hydrogen carbonate forms

D) Calcium chloride forms

Question 28: What are limestone, chalk, and marble examples of?

A) Metal carbonates

B) Metal hydrogen carbonates

C) Metal oxides

D) Different forms of calcium carbonate

Question 29: What are the products of the reaction between metal carbonates or metal hydrogen carbonates and acids?

A) Salt, carbon dioxide, and water

B) Salt, oxygen, and water

C) Salt, hydrogen gas, and water

D) Salt, carbon monoxide, and water

Question 30: What is the chemical equation representing the reaction between sodium hydroxide and hydrochloric acid?

A) NaOH(aq) + HCl(aq) → NaCl(aq) + H₂O(l)

B) NaCl(aq) + H₂O(l) → NaOH(aq) + HCl(aq)

C) NaCl(aq) + HCl(aq) → NaOH(aq) + H₂O(l)

D) NaOH(aq) + H₂O(l) → NaCl(aq) + HCl(aq)

Question 31: What type of reaction is the reaction between sodium hydroxide and hydrochloric acid?

A) Combustion reaction

B) Redox reaction

C) Neutralization reaction

D) Displacement reaction

Question 32: What are the products of a neutralisation reaction between an acid and a base?

A) Salt and water

B) Salt and oxygen

C) Salt and hydrogen gas

D) Salt and carbon dioxide

Question 33: How can a neutralisation reaction be generally represented?

A) Acid + Base → Salt + Water

B) Acid + Base → Salt + Oxygen

C) Acid + Base → Salt + Hydrogen gas

D) Acid + Base → Salt + Carbon dioxide

Question 34: What happens to the acidic and basic properties in a neutralisation reaction?

A) They combine to form a gas

B) They combine to form a solid

C) They cancel each other out

D) They remain unchanged

Question 35: What are some applications of neutralisation reactions?

A) Production of metals

B) pH regulation

C) Combustion reactions

D) Photosynthesis

Question 36: What is the role of neutralisation reactions in the treatment of acid indigestion?

A) They neutralise excess stomach acid

B) They increase stomach acid production

C) They provide essential nutrients

D) They promote digestion

Question 37: What is the product formed when copper oxide reacts with hydrochloric acid?

A) Copper

B) Oxygen gas

C) Copper(II) chloride

D) Water

Question 38: What is the colour of the solution when copper oxide reacts with hydrochloric acid?

A) Red

B) Yellow

C) Blue-green

D) Colourless

Question 39: What is the general equation for the reaction between a metal oxide and an acid?

A) Metal oxide + Acid → Salt + Water

B) Metal oxide + Acid → Salt + Oxygen

C) Metal oxide + Acid → Salt + Hydrogen gas

D) Metal oxide + Acid → Salt + Carbon dioxide

Question 40: Why are metal oxides considered basic oxides?

A) They are acidic in nature

B) They react with bases to form salts

C) They neutralise acids and exhibit basic characteristics

D) They do not react with any other compounds

Question 41: How do basic oxides differ from acidic oxides?

A) Basic oxides react with acids, while acidic oxides react with bases

B) Basic oxides exhibit acidic characteristics, while acidic oxides exhibit basic characteristics

C) Basic oxides form salts and water, while acidic oxides form gases

D) Basic oxides have a red colour, while acidic oxides have a blue colour

Question 42: What is the product formed when calcium hydroxide reacts with carbon dioxide?

A) Calcium

B) Oxygen gas

C) Calcium carbonate 

D) Water

Question 43: What is the general nature of calcium hydroxide in terms of acidity or basicity?

A) Acidic

B) Neutral

C) Basic

D) Amphoteric

Question 44: How does the reaction between calcium hydroxide and carbon dioxide resemble the reaction between a base and an acid?

A) Both reactions produce salt and water as products

B) Both reactions produce oxygen gas as a product

C) Both reactions exhibit acidic properties

D) Both reactions exhibit basic properties

Question 45: What can be concluded about the nature of non-metallic oxides based on the reaction between calcium hydroxide and carbon dioxide?

A) Non-metallic oxides are basic in nature

B) Non-metallic oxides are acidic in nature

C) Non-metallic oxides are neutral in nature

D) Non-metallic oxides can be either acidic or basic

Question 46: How do non-metallic oxides react with bases?

A) They form salts and water

B) They form oxygen gas

C) They exhibit basic properties

D) They do not react with bases

Question 47: What properties do non-metallic oxides exhibit when they react with bases?

A) Acidic properties

B) Basic properties

C) Neutral properties

D) Amphoteric properties

Question 48: What is a common property of acids?

A) Ability to accept hydrogen ions (H⁺)

B) Ability to release hydroxide ions (OH⁻)

C) Ability to release hydrogen ions (H⁺)

D) Ability to accept hydroxide ions (OH⁻)

Question 49: What is the role of acids as proton donors?

A) They donate hydroxide ions (OH⁻) to other substances

B) They accept hydrogen ions (H⁺) from other substances

C) They donate hydrogen ions (H⁺) to other substances

D) They accept hydroxide ions (OH⁻) from other substances

Question 50: What is a common property of bases?

A) Ability to accept hydrogen ions (H⁺)

B) Ability to release hydroxide ions (OH⁻)

C) Ability to release hydrogen ions (H⁺)

D) Ability to accept hydroxide ions (OH⁻)

Question 51: What is the role of bases as proton acceptors?

A) They donate hydroxide ions (OH⁻) to other substances

B) They accept hydrogen ions (H⁺) from other substances

C) They donate hydrogen ions (H⁺) to other substances

D) They accept hydroxide ions (OH⁻) from other substances

Question 52: What happens when acids and bases react in a neutralisation process?

A) They release hydrogen gas

B) They release oxygen gas

C) They form salt and water

D) They form carbon dioxide gas

Question 53: What happens to the ability of acids and bases to conduct electricity when they are dissolved in water?

A) They lose their ability to conduct electricity

B) They gain the ability to conduct electricity

C) They remain neutral and do not conduct electricity

D) They both exhibit different levels of conductivity

Question 54: What is the process called when acids and bases combine to form salt and water?

A) Ionisation

B) Dissociation

C) Neutralization

D) Hydrolysis

Question 55: Which ions are involved in the conductance of electricity by acids and bases?

A) Hydrogen ions (H⁺) and hydroxide ions (OH⁻)

B) Sodium ions (Na⁺) and chloride ions (Cl⁻)

C) Calcium ions (Ca²⁺) and carbonate ions (CO₃²⁻)

D) Ammonium ions (NH₄⁺) and nitrate ions (NO₃⁻)

Question 56: What is the result of the reaction between HCl and water?

A) Formation of hydronium ions (H₃O⁺) and chloride ions (Cl⁻)

B) Formation of hydrogen gas (H₂) and oxygen gas (O₂)

C) Formation of water molecules (H₂O) only

D) Formation of hydroxide ions (OH⁻) and chloride ions (Cl⁻)

Question 57: Which ions do bases generate when dissolved in water?

A) Hydroxide ions (OH⁻)

B) Hydronium ions (H₃O⁺)

C) Hydrogen ions (H⁺)

D) Chloride ions (Cl⁻)

Question 58: What is the result of the reaction between hydrogen ions (H⁺) and hydroxide ions (OH⁻)?

A) Formation of water (H₂O)

B) Formation of hydrogen gas (H₂)

C) Formation of oxygen gas (O₂)

D) Formation of chloride ions (Cl⁻)

Question 59: What is the term for the process of decreasing the concentration of ions in a solution by adding water?

A) Dissociation

B) Neutralisation

C) Dilution

D) Ionization

Question 60: Why is it important to add acid slowly to water when diluting acids?

A) To prevent excessive heat generation

B) To speed up the dilution process

C) To increase the concentration of ions

D) To avoid container breakage

Question 61: Which substances are labelled with warning signs due to their potential hazards during handling and dilution?

A) Solid bases like sodium hydroxide (NaOH)

B) Hydrogen gas (H₂)

C) Concentrated acids like nitric acid or sulfuric acid

D) Water (H₂O)

Question 62: What is the common characteristic of all acids?

A) They release hydroxide ions (OH⁻) when dissolved in water.

B) They accept hydrogen ions (H⁺) from other substances.

C) They release hydrogen ions (H⁺) when dissolved in water.

D) They release oxygen gas (O₂) when reacted with metals.

Question 63: Which ions do bases accept or donate when dissolved in water?

A) Hydroxide ions (OH⁻)

B) Hydrogen ions (H⁺)

C) Nitrate ions (NO₃⁻)

D) Sodium ions (Na⁺)

Question 64: What happens when acids and bases react with each other?

A) They form a gas.

B) They form a solid.

C) They form salt and water.

D) They form an explosive compound.

Question 65: How do acids and bases affect the colour of certain indicators?

A) They do not have any effect on indicators.

B) They cause indicators to emit a specific smell.

C) They change the colour of indicators.

D) They produce a bubbling effect in indicators.

Question 66: What type of reaction occurs when acids and bases combine?

A) Oxidation

B) Reduction

C) Neutralization

D) Precipitation

Question 67: How do acid-base indicators distinguish between acids and bases?

A) By measuring the temperature change

B) By detecting the presence of hydrogen gas

C) By observing colour changes

D) By measuring the electrical conductivity

Question 68: What happens to the concentration of H⁺ or OH⁻ ions when a solution is diluted?

A) It increases

B) It remains the same

C) It fluctuates

D) It decreases

Question 69: What does the pH scale measure in a solution?

A) The concentration of hydroxide ions

B) The concentration of hydrogen ions

C) The temperature of the solution

D) The electrical conductivity

Question 70: What does a pH value of 7 indicate?

A) Acidity

B) Alkalinity

C) Neutrality

D) Fluctuation

Question 71: How does the pH value reflect the hydronium ion concentration in a solution?

A) Higher concentration corresponds to higher pH values

B) Higher concentration corresponds to lower pH values

C) It remains constant regardless of concentration

D) It has no correlation with hydronium ion concentration

Question 72: What determines the strength of an acid or base?

A) The volume of the solution

B) The density of the solution

C) The number of H⁺ or OH⁻ ions it produces

D) The colour of the solution

Question 73: Do strong acids produce more or fewer hydrogen ions?

A) More

B) Fewer

Question 74: Do weak bases produce more or fewer hydroxide ions?

A) More

B) Fewer

Question 75: How is the distinction between weak and strong bases determined?

A) By their colour change in indicators

B) By their ability to conduct electricity

C) By their ability to release hydroxide ions into a solution

D) By their boiling point

Question 76: What is the pH value of a solution that is highly acidic?

A) pH 1

B) pH 7

C) pH 10

D) pH 14

Question 77: What is the pH value of a solution that is highly alkaline?

A) pH 1

B) pH 7

C) pH 10

D) pH 14

Question 78: What is the pH value of a neutral solution?

A) pH 1

B) pH 7

C) pH

10 D) pH 14

Question 79: Which of the following substances is an example of a strong acid?

A) Vinegar (acetic acid)

B) Lemon juice (citric acid)

C) Hydrochloric acid (HCl)

D) Carbonic acid (H2CO₃)

Question 80: Which of the following substances is an example of a weak acid?

A) Vinegar (acetic acid)

B) Nitric Acid (HNO₃)

C) Hydrochloric acid (HCl)

D) Sulfuric acid (H2SO₄)

Question 81: Which of the following substances is an example of a strong base?

A) Ammonia (NH₃)

B) Sodium hydroxide (NaOH)

C) Acetic acid (CH₃COOH)

D) Carbon dioxide (CO₂)

Question 82: Which of the following substances is an example of a weak base?

A) Ammonia (NH₃)

B) Sodium hydroxide (NaOH)

C) Acetic acid (CH₃COOH)

D) Carbon dioxide (CO₂)

Question 83: What is the main difference between a strong acid and a weak acid?

A) The concentration of hydrogen ions they produce

B) The colour change they cause in indicators

C) The volume of the solution they occupy

D) The temperature at which they boil

Question 84: What is the main difference between a strong base and a weak base?

A) The concentration of hydroxide ions they produce

B) The colour change they cause in indicators

C) The volume of the solution they occupy

D) The temperature at which they boil

Question 85: Which of the following is true about the pH scale?

A) It ranges from -14 to +14:

B) It measures the concentration of hydroxide ions.

C) It is a logarithmic scale.

D) It is linear and evenly spaced.

Question 86: What is the pH range crucial for the proper functioning of our body?

A) pH 0 to 3

B) pH 4 to 6

C) pH 7 to 7:8

D) pH 8 to 10

Question 87: Acid rain is harmful to aquatic life when it flows into rivers because it:

A) Increases the pH of the water

B) Has a pH greater than 7:0

C) Lowers the pH of the water

D) Causes the water to become neutral

Question 88: Which substance is used to neutralise excess stomach acid?

A) Antacids

B) Acid rain

C) Toothpaste

D) Baking soda

Question 89: Tooth decay occurs when the pH in the mouth:

A) Rises above 7:0

B) Drops below 5:5

C) Stays neutral at pH 7:0

D) Stays constant at pH 5:5

Question 90: What can neutralise the acids present in bee stings and nettle leaf stings?

A) Acids

B) Antacids

C) Baking soda

D) Toothpaste

Question 91: Which pH range is considered acidic?

A) pH 1 to 3

B) pH 4 to 6

C) pH 7 to 9

D) pH 10 to 12

Question 92: What is the function of hydrochloric acid in the stomach?

A) Neutralising excess acids

B) Breaking down sugars

C) Protecting tooth enamel

D) Aiding in food digestion

Question 93: How can cleaning the mouth after eating help prevent tooth decay?

A) By increasing the pH of the mouth

B) By neutralising excess acid

C) By promoting bacterial growth

D) By strengthening tooth enamel

Question 94: What pH range is characteristic of basic substances?

A) pH 0 to 3

B) pH 4 to 6

C) pH 7 to 9

D) pH 10 to 12

Question 95: What is the purpose of using basic toothpaste?

A) To lower the pH of the mouth

B) To neutralise excess acid

C) To promote tooth decay

D) To increase acid production

Question 96: Why can acid rain be harmful to aquatic life?

A) It increases the pH of the water.

B) It lowers the pH of the water.

C) It neutralises excess acids in the water.

D) It promotes bacterial growth in the water.

Question 97: What can checking soil pH and observing plant growth provide insights into?

A) pH requirements of plants

B) pH requirements of animals

C) pH requirements of water

D) pH requirements of soil

Question 98: What is the function of antacids in relieving discomfort caused by excessive stomach acid?

A) Increasing acid production

B) Lowering the pH of the stomach

C) Neutralising excess stomach acid

D) Stimulating food digestion

Question 99: Why does applying baking soda provide relief from bee sting or nettle leaf sting?

A) It increases acid production.

B) It neutralises the basic sting.

C) It lowers the pH of the sting.

D) It promotes bacterial growth in the sting.

Question 100: How are salts formed?

A) By combining two bases

B) By combining two acids

C) By combining an acid and a base

D) By combining two salts

Question 101: What is a common characteristic of salts?

A) Liquid at room temperature

B) Gaseous at room temperature

C) Crystalline structure

D) High solubility in water

Question 102: What is the solubility of salts in water based on?

A) Their colour

B) Their size

C) Their composition

D) Their density

Question 103: What are some properties exhibited by salts?

A) Melting point and boiling point

B) Colour and odour

C) Density and conductivity

D) Solubility and reactivity

Question 104: How are salts typically at room temperature?

A) Liquid

B) Solid

C) Gas

D) Vapours

Question 105: When a salt is formed from a strong acid and a strong base, what is the pH value of the resulting solution?

A) Less than 7

B) Equal to 7

C) Greater than 7

D) Cannot be determined

Question 106: What is the nature of the solution when a salt is formed from a strong acid and a weak base?

A) Acidic

B) Basic

C) Neutral

D) Cannot be determined

Question 107: When a salt is formed from a strong base and a weak acid, what is the pH value of the resulting solution?

A) Less than 7

B) Equal to 7

C) Greater than 7

D) Cannot be determined

Question 108: What contributes to the acidity of a salt solution formed from a strong acid and a weak base?

A) Strong acid

B) Weak acid

C) Strong base

D) Weak base

Question 109: What contributes to the basicity of a salt solution formed from a strong base and a weak acid?

A) Strong acid

B) Weak acid

C) Strong base

D) Weak base

Question 110: The acidity of a salt solution formed from a strong acid and a weak base is due to:

A) The strong acid component

B) The weak acid component

C) The strong base component

D) The weak base component

Question 111: Salts formed from a strong base and a weak acid are generally:

A) Acidic

B) Basic

C) Neutral

D) It depends on the specific acid and base used

Question 112: What determines the basicity of a salt solution formed from a strong base and a weak acid?

A) The strong acid component

B) The weak acid component

C) The strong base component

D) The weak base component

Question 113: If a salt solution has a pH value of 8, it is most likely formed from:

A) A strong acid and a strong base

B) A strong acid and a weak base

C) A weak acid and a strong base

D) A weak acid and a weak base

Question 114: Sodium chloride is formed by the combination of which two compounds?

A) Hydrochloric acid and sodium chloride

B) Hydrochloric acid and sodium hydroxide

C) Sodium chloride and sodium hydroxide

D) Sodium chloride and hydrochloric acid

Question 115: Sodium chloride is commonly known as:

A) Common salt

B) Rock salt

C) Sea salt

D) Sodium hydroxide

Question 116: Sodium chloride is considered a _________ salt.

A) Acidic

B) Basic

C) Neutral

D) Alkaline

Question 117: What is the source of sodium chloride found in seawater?

A) Mining

B) Evaporation

C) Chemical synthesis

D) Combustion

Question 118: Solid salt deposits found in various parts of the world are known as:

A) Sodium chloride crystals

B) Sea salt

C) Rock salt

D) Impure salt

Question 119: Which compound is the main dissolved salt in seawater?

A) Sodium chloride

B) Potassium chloride

C) Calcium chloride

D) Magnesium chloride

Question 120: What is the colour of rock salt crystals obtained through mining?

A) White

B) Brown

C) Blue

D) Transparent

Question 121: How is sodium chloride separated from other salts in seawater?

A) Distillation

B) Filtration

C) Evaporation

D) Precipitation

Question 122: Which compound is responsible for the brown colour of rock salt crystals?

A) Sodium chloride

B) Impurities

C) Sodium hydroxide

D) Potassium chloride

Question 123: Sodium chloride is commonly used in which application?

A) Food

B) Medicine

C) Cleaning products

D) Construction

Question 124: What is common salt used as a raw material for?

A) Sodium hydroxide

B) Baking soda

C) Washing soda

D) All of the above

Question 125: Which of the following substances is NOT mentioned as being produced from common salt?

A) Sodium hydroxide

B) Baking soda

C) Bleaching powder

D) Hydrochloric acid

Question 126: What is the purpose of sodium hydroxide?

A) Food seasoning

B) Cleaning agent

C) Baking ingredient

D) Fertiliser

Question 127: What is the purpose of baking soda?

A) Neutralising acids

B) Whitening clothes

C) Treating heartburn D) All of the above

Question128: What is the purpose of bleaching powder?

A) Sanitising surfaces

B) Removing stains

C) Disinfecting water

D) All of the above

Question 129: Which substance is NOT mentioned as being produced from common salt?

A) Sodium chloride

B) Sodium hydroxide

C) Baking soda

D) Bleaching powder

Question 130: What is the primary raw material used in the production of sodium hydroxide?

A) Common salt

B) Baking soda

C) Washing soda

D) Bleaching powder

Question 131: Which of the following substances is commonly used as a cleaning agent?

A) Sodium chloride

B) Baking soda

C) Sodium hydroxide

D) Bleaching powder

Question 132: What is the purpose of washing soda?

A) Food seasoning

B) Cleaning agent

C) Baking ingredient

D) Water softener

Question 133: Which substance is commonly used for whitening clothes?

A) Sodium chloride

B) Baking soda C)

Sodium hydroxide

D) Bleaching powder

Question 134: What is the process called when electricity is passed through a solution of sodium chloride?

A) Electrolysis

B) Ionisation

C) Neutralisation

D) Precipitation

Question 135: What are the products obtained from the chlor-alkali process using sodium chloride?

A) Sodium hydroxide, chlorine gas, and hydrogen gas

B) Sodium chloride, chlorine gas, and hydrogen gas

C) Sodium hydroxide, oxygen gas, and hydrogen gas

D) Sodium chloride, oxygen gas, and hydrogen gas

Question 136: Where is chlorine gas released during the chlor-alkali process?

A) Anode

B) Cathode

C) Both anode and cathode

D) Neither anode nor cathode

Question 137: Which gas is produced at the cathode during the chlor-alkali process?

A) Chlorine gas

B) Hydrogen gas

C) Oxygen gas

D) Sodium gas

Question 138: What is formed near the cathode during the chlor-alkali process?

A) Chlorine gas

B) Hydrogen gas

C) Sodium hydroxide solution

D) Sodium chloride solution

Question 139: What is the main purpose of passing electricity through a solution of sodium chloride in the chlor-alkali process?

A) To produce sodium chloride

B) To produce sodium hydroxide, chlorine gas, and hydrogen gas

C) To neutralise the solution

D) To remove impurities from the solution

Question 140: What gas is released at the anode during the chlor-alkali process?

A) Sodium gas

B) Hydrogen gas

C) Chlorine gas

D) Oxygen gas

Question 141: Which product of the chlor-alkali process is collected for use near the cathode?

A) Sodium chloride

B) Sodium hydroxide solution

C) Hydrogen gas

D) Chlorine gas

Question 142: What are the practical applications of chlorine gas obtained from the chlor-alkali process?

A) Making sodium hydroxide

B) Disinfecting water colour

C) Producing hydrogen gas

D) Baking soda production

Question 143: Which substance is NOT a product of the chlor-alkali process?

A) Sodium hydroxide

B) Chlorine gas

C) Sodium chloride

D) Hydrogen gas

Question 144: How is chlorine gas obtained for the production of bleaching powder?

A) By heating sodium chloride

B) By reacting sodium chloride with water

C) By the electrolysis of aqueous sodium chloride

D) By combining sodium chloride with oxygen

Question 145: What is the main component of bleaching powder?

A) Sodium chloride

B) Calcium hydroxide

C) Chlorine gas

D) Oxygen gas

Question 146: What is the chemical equation for the formation of bleaching powder?

A) CaCl₂ + NaOH → CaOCl₂ + H₂O

B) Ca(OH)₂ + Cl₂ → CaOCl₂ + H₂O

C) CaCl₂ + H₂O → CaOCl₂ + HCl

D) Ca(OH)₂ + HCl → CaOCl₂ + H₂O

Question 147: Which of the following is NOT an application of bleaching powder?

A) Bleaching textiles and paper

B) Acting as a reducing agent in chemical industries

C) Purifying drinking water

D) Bleaching washed clothes in laundry

Question 148: How does bleaching powder purify drinking water?

A) By adding colour to the water

B) By removing odour from the water

C) By eliminating germs in the water

D) By increasing the pH of the water

Question 149: What is the purpose of using bleaching powder in the textile industry?

A) To increase the durability of fabrics

B) To add fragrance to the fabrics

C) To remove stains and brighten the fabrics

D) To improve the softness of the fabrics

Question 150: Which component of bleaching powder acts as an oxidising agent?

A) Sodium chloride

B) Calcium hydroxide

C) Chlorine gas

D) Water

Question 151: What is the chemical formula of bleaching powder?

A) NaCl

B) Ca(OH)₂

C) CaOCl₂

D) H₂O

Question 152: In which industries is bleaching powder commonly used as an oxidising agent?

A) Textile and paper industries

B) Food and beverage industries

C) Automotive and aerospace industries

D) Pharmaceutical and medical industries

Question 153: How does bleaching powder help in purifying drinking water?

A) By removing dissolved minerals from the water

B) By neutralising acidity in the water

C) By improving the taste of the water

D) By disinfecting and killing bacteria in the water

Question 154: What is the chemical name of baking soda?

A) Sodium chloride

B) Sodium hydrogen carbonate

C) Sodium carbonate

D) Sodium nitrate

Question 155: Which raw material is used in the production of sodium hydrogen carbonate?

A) Sodium chloride

B) Sodium carbonate

C) Sodium hydroxide

D) Sodium nitrate

Question 156: What is the chemical equation for the reaction involved in baking soda formation?

A) NaCl + H₂O + CO₂ + NH₃ → NH₄Cl + NaHCO₃

B) NaHCO₃ + H₂O → NaOH + CO₂

C) NaCl + CO₂ → Na₂CO₃ + Cl₂

D) NaHCO₃ + HCl → NaCl + H₂O + CO₂

Question 157: What does baking soda transform into when heated during cooking? 

A) Sodium chloride

B) Sodium carbonate

C) Sodium hydroxide

D) Sodium nitrate

Question 158: What is the purpose of adding baking soda in antacids?

A) To neutralise excess stomach acid

B) To increase the pH of the stomach

C) To enhance digestion

D) To prevent gas formation

Question 159: What role does baking soda play in soda-acid fire extinguishers?

A) It acts as a cooling agent

B) It generates carbon dioxide gas

C) It increases the acidity of the extinguishing agent

D) It provides a foaming effect

Question 160: Which chemical reaction is responsible for the formation of bleaching powder?

A) NaCl + H₂O + CO₂ + NH₃ → NH₄Cl + NaHCO₃

B) Ca(OH)₂ + Cl₂ → CaOCl₂ + H₂O

C) NaHCO₃ + HCl → NaCl + H₂O + CO₂

D) NaCl + H₂O + CO₂ → NaHCO₃ + HCl

Question 161: What are the applications of bleaching powder?

A) Textile bleaching

B) Water purification

C) Oxidising agent

D) All of the above

Question 162: What is the chemical formula of baking soda?

A) NaCl B) NaOH

C) NaHCO₃

D) Na₂CO₃

Question 163: What role does baking soda play in the production of bread or cake?

A) It acts as a preservative.

B) It provides colour to the baked goods.

C) It adds flavour to the baked goods.

D) It produces carbon dioxide to make the bread or cake rise.

Question 164: What is the primary function of baking soda in antacids?

A) It helps in digestion.

B) It reduces stomach acid production.

C) It neutralises excess stomach acid.

D) It provides a cooling effect.

Question 165: What is the purpose of baking soda in soda-acid fire extinguishers?

A) It acts as a cooling agent.

B) It produces water to extinguish the fire.

C) It releases carbon dioxide gas to smother the fire.

D) It provides a foaming effect.

Question 166: How is washing soda obtained from baking soda?

A) By adding water to baking soda

B) By heating and recrystallizing baking soda

C) By mixing baking soda with vinegar

D) By filtering baking soda solution

Question 167: What is the chemical formula of washing soda?

A) NaCl

B) NaOH

C) NaHCO₃

D) Na₂CO₃

Question 168: What does the formula Na₂CO₃.10H₂O signify?

A) It indicates the presence of sodium and carbon dioxide.

B) It represents the structure of washing soda crystals.

C) It signifies that washing soda is wet.

D) It denotes the number of water molecules in washing soda.

Question 169: In which industries is washing soda commonly used?

A) Textile and food industries

B) Glass, soap, and paper industries

C) Electronics and automotive industries

D) Pharmaceutical and cosmetic industries

Question 170: What is the role of washing soda in removing permanent hardness from water?

A) It adds minerals to the water.

B) It acts as a disinfectant for water.

C) It neutralises acidity in water.

D) It precipitates calcium and magnesium ions.

Question 171: Can sodium carbonate be used as a cleaning agent for household purposes?

A) Yes, it is effective in removing stains and grease.

B) No, it is not suitable for household cleaning.

C) Only if mixed with other chemicals.

D) Only for specific surfaces.

Question 172: How is washing soda obtained from sodium chloride (common salt)?

A) By mixing sodium chloride with water

B) By heating sodium chloride and recrystallizing the resulting compound

C) By adding baking soda to sodium chloride

D) By filtering a solution of sodium chloride

Question 173: What is the chemical formula of washing soda?

A) NaCl

B) NaOH

C) NaHCO₃

D) Na₂CO₃

Question 174: What does the formula Na₂CO₃.10H₂O indicate?

A) The presence of water on the surface of washing soda crystals

B) The amount of water required to dissolve washing soda

C) The number of water molecules chemically bound within washing soda crystals

D) The water content in the washing soda solution

Question 175: In which industries is washing soda commonly used?

A) Textile and food industries

B) Glass, soap, and paper industries

C) Electronics and automotive industries

D) Pharmaceutical and cosmetic industries

Question 176: What is the role of washing soda in removing permanent hardness from water?

A) It adds minerals to the water.

B) It acts as a disinfectant for water.

C) It neutralises acidity in water.

D) It precipitates calcium and magnesium ions.

Question 177: Can sodium carbonate be used as a cleaning agent for household purposes?

A) Yes, it is effective in removing stains and grease.

B) No, it is not suitable for household cleaning.

C) Only if mixed with other chemicals.

D) Only for specific surfaces.

Question 178: What gives copper sulphate crystals their blue colour?

A) Copper ions

B) Sulphate ions

C) Water of crystallisation

D) Impurities

Question 179: What happens to the colour of copper sulphate crystals when heated?

A) They turn blue

B) They turn white

C) They turn green

D) They remain the same colour

Question 180: What causes the blue colour to reappear when white copper sulphate crystals are moistened with water?

A) Presence of impurities

B) Reaction with oxygen

C) Formation of new compounds

D) Reabsorption of water of crystallisation

Question 181: What does water of crystallisation refer to?

A) Water molecules that are physically attached to the salt crystals

B) Water vapour surrounding the salt crystals

C) Water droplets formed on the surface of the salt crystals

D) Water molecules chemically bound within the salt crystal structure

Question 182: How many water molecules are present in the formula unit of copper sulphate?

A) 2

B) 3

C) 4

D) 5

Question 183: What is the chemical formula of gypsum?

A) CuSO₄.5H₂O

B) CaSO₄.2H₂O

C) CaSO₄.7H₂O

D) CaSO₄.1/2H₂O

Question 184: What is the colour of copper sulphate crystals due to?

A) Copper ions

B) Sulphate ions

C) Water of crystallisation

D) Impurities

Question 185: What happens to the colour of copper sulphate crystals when heated?

A) They turn blue

B) They turn white

C) They turn green

D) They remain the same colour

Question 186: When the white copper sulphate crystals are moistened with water, what colour reappears?

A) Blue

B) White

C) Green

D) Red

Question 187: What does water of crystallisation represent in a salt?

A) Water molecules physically attached to the salt crystals

B) Water droplets formed on the surface of the salt crystals

C) Water vapour surrounding the salt crystals

D) Water molecules chemically bound within the salt crystal structure

Question 188: How many water molecules are present in the formula unit of copper sulphate?

A) 2

B) 3

C) 4

D) 5

Question 189: Which salt contains two water molecules as water of crystallisation?

A) Copper sulphate

B) Sodium chloride

C) Gypsum

D) Sodium carbonate

Question 190: What is the chemical name of calcium sulphate hemihydrate?

A) Gypsum

B) Plaster of Paris

C) Calcium sulphate

D) Hemihydrate

Question 191: What happens to gypsum when heated at 373 K?

A) It turns into Plaster of Paris

B) It dissolves in water

C) It forms calcium sulphate

D) It remains unchanged

Question 192: In the reaction of Plaster of Paris with water, what is formed?

A) Calcium sulphate hemihydrate

B) Gypsum

C) Calcium sulphate dihydrate

D) Calcium sulphate anhydrous

Question 193: What is the chemical equation for the reaction of Plaster of Paris with water?

A) CaSO₄.1/2H₂O + H₂O → CaSO₄.1/2H₂O

B) CaSO₄.2H₂O + H₂O → CaSO₄.1/2H₂O

C) CaSO₄.1/2H₂O + 3/2 H₂O → CaSO₄.2H₂O

D) CaSO₄.2H₂O + H₂O → CaSO₄.2H₂O

Question 194: What does the notation “1/2H₂O” represent in calcium sulphate hemihydrate?

A) One water molecule

B) Two water molecules

C) Half a water molecule

D) No water molecule

Question 195: Apart from medical applications, where else is Plaster of Paris commonly used?

A) Cooking ingredients

B) Construction materials

C) Cleaning agents

D) Electrical components

Question 196: What is the chemical name of the compound commonly known as “Plaster of Paris”?

A) Calcium carbonate

B) Calcium sulphate

C) Calcium hydroxide

D) Calcium chloride

Question 197: What happens to gypsum when heated at 373 K?

A) It dissolves in water

B) It decomposes into calcium and sulphur

C) It loses water molecules and forms calcium sulphate hemihydrate

D) It remains unchanged

Question 198: What is the chemical formula of calcium sulphate hemihydrate?

A) CaSO₄

B) CaSO₄·2H₂O

C) CaSO₄·1/2H₂O

D) CaSO₄·H₂O

Question 199: What happens when Plaster of Paris is mixed with water?

A) It forms a hard solid mass

B) It dissolves completely

C) It evaporates

D) It becomes a gas

Question 200: Why is calcium sulphate hemihydrate called “Plaster of Paris”?

A) It was first discovered in Paris

B) It is commonly used in Parisian architecture

C) It has a white colour similar to the buildings in Paris

D) It was historically associated with the city of Paris due to its extensive use in plasterwork

Answer Key