Hydrogen chloride gas fumes in moist air but hydrogen sulphide gas does not. Give reasons.

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Solution

Hydrogen chloride gas fumes in moist air because it has high solubility. It forms a mist of droplets of hydrogen chloride. The HCl gas mixes with the atmospheric vapour to form a mist which appears as white fumes. Whereas hydrogen sulphide is a colourless gas with the characteristic foul odour of rotten eggs.

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