Question

what do you observe when ammonia is brought in contact of hydrogen chloride gas

Answer 1

dense white fumes of NH4Cl 

Answer 2

Here is your answer friend...

The reaction equation between ammonia (NH3) and hydrochloric acid (HCl) is written as follows, NH3 + HCl -> NH4Cl, Ammonia is a weak base that reacts with hydrochloric acid forming a compound called ammonium chloride.
The generation of a white cloud of ammonium chloride, NH4Cl

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