Q29 of 79 Page 3

How is chloride of lime chemically different from calcium chloride? Why does chloride of lime gradually lose its chlorine when kept exposed to air?

Chemically, chloride of lime is calcium oxy chloride, CaOCl2, also called bleaching powder. When exposed to air it gradually lose its chlorine because it reacts with carbon dioxide present in air to produce calcium carbonate and chlorine gas.

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27 Write chemical equations for reactions taking place when
i. Zinc carbonate is calcined.
ii. Ammonia gas is passed over heated copper (II) oxide. 28 (i) What is the colour of potassium dichromate solution?
(ii) What is the colour of Cr3+ ion?
(iii) What property of SO2 is responsible for bringing change of colour of potassium dichromate? 30 Write short notes on the bleaching action of sulphur dioxide. 31 (a) What is the atomicity of sulphur?
(b) How do you bring the change of rhombic sulphur to monoclinic sulphur and vice versa?
(c) What is the action of conc. HNO3 on sulphur?