Nitrogen gas is prepared :

Options

A. by heating ammonium nitrate
B. by reacting excess chlorine with liquor ammonia
C. by passing `HNO_(3)` vapours on red hot copper.
D. by heating lead nitrate

Answer

C

Explanation

(A)`(NH_(4))NO_(3)` gives `N_(2)O`,
(B)chlorine (excess) with liquor `NH_(3)` forms `NCl_(3)` and (D) `Pb(NO_(3))_(2)` gives `NO_(2)` not `N_(2)` on heating.
(C )`5Cu`(red hot)+`2HNO_(3) to 5CuO + N_(2) uarr +H_(2)O`