p-Block elementsHard

Question

Nitrogen gas is prepared :

Options

A.by heating ammonium nitrate
B.by reacting excess chlorine with liquor ammonia
C.by passing HNO3 vapours on red hot copper.
D.by heating lead nitrate.

Solution

(A) (NH4)NO3 gives N2O, (B) chlorine (excess) with liquor NH3 forms NCl3 and (D) Pb(NO3)2 gives NO2 not N2 on heating.
(C) 5Cu (red hot) + 2HNO3 → 5CuO + N2 ↑ + H2O

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