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Question

Hina dipped a glass rod in conc. HCl and observed faint fumes. These fumes became dense when she dipped the same glass rod in NH3 gas. The possible reason for Hina's observation is:

A
the sublimation of NH4Cl which is formed when HCl reacts with NH3.
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B
the condensation of NH4Cl which is formed when HCl reacts with NH3.
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C
the sublimation of NH4OH which is formed when HCl reacts with NH3.
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D
the evaporation of NH4OH which is formed when HCl reacts with NH3.
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Solution

The correct option is A the sublimation of NH4Cl which is formed when HCl reacts with NH3.
When a glass rod is dipped in conc. HCl, the faint fumes are observed. This is due to the reaction of HCl with moisture in the air.

A solid ammonium chloride is formed when this rod is dipped in NH3 gas. The reaction involved is as follows:

NH3(g)+HCl (g)NH4Cl (s)

This solid ammonium chloride undergoes sublimation and gets converted to ammonium chloride gas which gives dense fume.

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