a)Identify the compound of calcium which is yellowish white powder and is used for disinfecting drinking water. Write its name and its formula. How is it manufactured? Write chemical equation for the reaction involved. Mention one more use of the compound.
b) Write balanced equation for the preparation of the following salts:

i) NaNO₃ ii)K₂SO₄

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Solution

(a) The yellowish white powder of calcium which is used in disinfecting drinking water is bleaching powder. It is chemically known as calcium oxychloride, and is represented by the chemical formula CaOCl₂. It is produced by the action of chlorine on dry slaked lime [Ca(OH)₂]. Following is the chemical equation for the reaction
Ca(OH)₂ + Cl₂ â†’ CaOCl₂ + H₂O
(b) Both the given chemical compounds are salts, which can be prepared by the action of an acid and a base.
(i) NaNO₃
The name of this salt is sodium nitrate. It can be prepared by the action of sodium hydroxide (chemical formula NaOH) and nitric acid (chemical formula HNO₃). Following is the chemical equation for the reaction
NaOH + HNO₃ â†’ NaNO₃ + H₂O
(ii) K₂SO₄
The name of this salt is potassium sulphate. It can be prepared by the action of potassium hydroxide and sulphuric acid. Following is the chemical equation for the reaction
2KOH + H₂SO₄ â†’ K₂SO₄ + 2H₂O

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