Question

1. What is bleaching powder How is bleaching powder prepared ? What happened
when bleaching powder react with dilute sulphuric acid ? State two important
uses of bleaching powder ?

​

Answer 1

Bleaching powder is Calcium oxychloride (CaOCl

2

). It is prepared by passing chlorine gas over dry slaked lime.

Reaction:

Ca(OH)

2

+

Cl

2

→

CaOCl

2

+

H

2

(b) When bleaching powder reacts with dilute sulphuric acid, it produces chlorine gas.

Reaction:

CaOCl

2

+

4

H

2

CaSO

4

+

Cl

2

(g)+

H

2

(c) Two important uses of bleaching powder are-

(i) It is used for disinfecting the drinking water supply.

(ii) It is used in the manufacture of chloroform.

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Answer 2

Answer:

A powder containing calcium hypochlorite, used chiefly to remove colour from materials..