Bleaching powder slowly loses its activity when it stands in air. This is due to :

Q. Bleaching powder is also called calcium chlorohypochlorite. It is a pale yellow powder and has a strong smell of chlorine. On account of formation of nascent oxygen it behaves as oxidising agent and bleaching agent. The amount of chlorine obtained from a sample of bleaching powder with excess of dilute acids or $C{O}_2$ is called available chlorine. The maximum percent of available chlorine comes to $49\%.$

$CaOC{l}_2+2C{H}_{3}COOH\to (C{H}_{3}COO{)}_{2}Ca+C{l}_2+H_{2}O$

$2Kl+C{l}_2\to 3KCl+l_2$

$l_2+2N{a}_2{S}_2{O}_3\to N{a}_2{S}_4{O}_6+2Nal$

Q. Write chemical name of bleaching powder. Which gas is released when it is exposed to air? Write chemical reaction involved in preparation of bleaching powder.

Q.

A metal with silvery appearance is slowly tarnished in air. It reacts with boiling water as well as dilute hydrochloric acid to evolve hydrogen gas.

(i) Identify the metal.
(ii) Also identify the reactions involved.

Q. Bleaching powder is disinfectant for purification of water when water born germs are killed. But disinfectant activity is destroyed. It is due to its disproportionation into:

Q. Bleaching action of $H_2{O}_2$ is due to its: