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(i). ZnO is usedj as a white paint inspi...

(i). `ZnO` is usedj as a white paint inspite of the fact that it has less convering power than white lead.
(ii). Hydrated `ZnCl_2` cannot be dehydrated on heating?
(iii). Zn is used in galvanisation of Fe.

Text Solution

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(i). `ZnO` is not blackened in atmosphere of `H_2S`. It can be used both as oil and water point. It is non-poisonous in nature.
(ii). On heating it reacts with water of crystallisation and forms zinc oxycloride.
`2ZnCl_2.2H_2Ooverset(Delta)toZn_2OCl_2+2HCl+3H_2O`
(iii). Zinc coating protects the iron from corrosion as Zn is not affected by `O_2` and `H_2O`.
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