Identify the gas from the following observations:
A colourless gas which fumes strongly in air and has a sharp biting smell. It gives dense white fumes with a glass rod dipped in HCl.

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Solution

A colourless gas which fumes strongly in air and has a sharp biting smell is Ammonia $({NH}_{3})$
When a rod dipped in Hydrochloric acid $(HCl)$ is brought near ammonia, dense white fumes or smog of Ammonium chloride $({NH}_{4} Cl)$ are produced.
${NH}_{3} (aq) + HCl (g) \to {NH}_{4} Cl (s) (Ammonia) (Hydrochloric acid) (Ammonium chloride) (white fumes)$

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Identify the gas from the following observations:A colourless gas which fumes strongly in air and has a sharp biting smell. It gives dense white fumes with a glass rod dipped in HCl.

Identify the gas from the following observations:
A colourless gas which fumes strongly in air and has a sharp biting smell. It gives dense white fumes with a glass rod dipped in HCl.