A solution of colourless salt H on boiling with excess NaOH produces a non-flammable gas. The gas evolution ceases after some time. On addition of Zn dust to the same solution, the gas evolution restarts. The colourless salt(s) H is (are) :
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(a,b)All ammonium salts on reaction with alkali produce ammonia. The nitrate and nitrite also on reduction with nascent hydrogen produced by the reaction of zinc and sodium hydroxide also produce the ammonia gas according to the following reactions.
NH 4 NO 2 + NaOH 
NaNO 2 + NH 3 + H 2 O
NH 4 NO 3 + NaOH 
NaNO 3 + NH 3 + H 2 O
NaNO 2 + 6[H] 
NaOH + NH 3 + H 2 O
NaNO 3 + 8 [H] 
NaOH + NH 3 + 2H 2 O
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