Answer:
(a) Nitrogen is largest constituent of air, when heated with hydrogen in the ratio of 1 : 3 in the presence of catalyst (Fe) gives a gas .
(1)
Nitrogen reacts with oxygen on heating to form nitrogen monoxide (R), which gets oxidised in the presence of to nitrogen dioxide. Nitrogen dioxide dissolves in water in the presence of oxygen to form nitric acid which is an oxidising agent.
(1)
(1)
P is Q is , R is NO and S is . (1)
(b) It belongs to group 15. (1)
Or
(a) These metals get corroded. Silver forms black silver sulphide and copper form greenish layer of basic copper carbonate
(2)
(b) Tamarind contains acid which reacts with basic copper carbonate and product gets dissolved and removed from copper vessel. (1½ )
(c) Aluminium forms oxide layer on its surface which does not further react with air. (1½)
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