(a) Complete the following chemical equations :

(i) Cu+HNO3dilute

(ii) XeF4+O2F2

(b) Explain the following observations :

(i) Phosphorus has greater tendency for catenation than nitrogen.

(ii) Oxygen is a gas but sulphur a solid.

(iii) The halogens are coloured. Why?

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#6 | 16th Group

Concept Questions :-

group 16,preparation and properties
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