Question : Which of the following is not soluble in water?
Option 1: Lead sulphate
Option 2: Zinc sulphate
Option 3: Potassium sulphate
Option 4: Sodium sulphate
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Correct Answer: Lead sulphate
Solution : The correct option is Lead sulphate.
Lead sulphate is considered insoluble in water and forms a solid precipitate when lead ions (Pb²⁺) and sulphate ions (SO₄²⁻) combine in a solution. The other compounds mentioned—zinc sulphate (ZnSO4), potassium sulphate (K2SO4), and sodium sulphate (Na2SO4)—are all soluble in water.
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Question : What is the chemical name of saltpetre?
Option 1: Potassium nitrate
Option 2: Potassium manganite
Option 3: Lead nitrate
Option 4: Lead sulphate
Question : Which of the following is used in photography?
Option 1: Sodium bicarbonate
Option 2: Sodium thiosulphate
Option 3: Sodium hydroxide
Question : Quartz is made of which of the following?
Option 1: Calcium sulphite
Option 2: Calcium silicate
Option 3: Sodium sulphate
Option 4: Sodium silicate
Question : Baking soda is ________________.
Option 1: sodium carbonate
Option 2: sodium sulphate
Option 3: sodium hydrogen carbonate
Option 4: sodium hydroxide
Question : Which of the following chemicals is used in photography ?
Option 1: Aluminium hydroxide
Option 2: Silver bromide
Option 3: Potassium nitrate
Option 4: Sodium chloride
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