Question

State your observation for the following cases:
(i) Ammonia gas is burnt in an atmosphere of oxygen in the absence of a catalyst.
(ii) Glass rod dipped in ammonium hydroxide is brought near the mouth of the concentrated hydrochloric acid bottle.

Answer 1

(i) In the absence of a catalyst, ammonia burns in air with a greenish yellow flame to produce nitrogen and water.

$4{\mathrm{NH}}_3+3{\mathrm{O}}_2\to 6{\mathrm{H}}_2\mathrm{O}+2{\mathrm{N}}_2+\mathrm{Heat}$

(ii) When a glass rod dipped in ammonium hydroxide is brought near the mouth of a concentrated hydrochloric acid bottle, white fumes of ammonium chloride are formed.

NH₄OH + HCl → NH₄Cl + H₂O