explain why hydrogen chloride gas fumes in moist air but dygrogen sulphide gas does not.

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

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

Select from the list the gas that matches the descriptions given in each case:

[ammonia, ethane, hydrogen chloride, hydrogen sulphide, ethyne]

This gas produces dense white fumes with ammonia gas.

Explain why :

(a) anhydrous HCl is a poor conductor while aqueous HCl is an excellent conductor.
(b) when the stopper of a bottle full of hydrogen chloride gas is opened there are fumes in the air.
(c) a solution of hydrogen chloride in water turns blue litmus red and conducts electricity, while a solution of the same gas in toluene :
(i) has no effect on litmus, and
(ii) does not conduct electricity.
(d) thick white fumes are formed when a glass rod dipped in $N H_{4} O H$ is brought near the mouth of a bottle full of HCl gas.
(e) dry hydrogen chloride gas does not affect a dry strip of blue litmus paper but it turns red in the presence of a drop of water.

(f) hydrogen chloride gas is not collected over water.

Q. (a) Hydrogen chloride solution in water turns blue litmus red and conducts electricity, while in toluene it does not. Explain why?
(b) Correct the following statement: HCl gas is not combustible but it supports combustion.
(c) Which of the following gas gives a white precipitate when reacted with silver nitrate solution acidified with dilute nitric acid?
(i) Ammonia
(ii) Hydrogen chloride
(iii) Hydrogen sulphide
(iv) Sulphur dioxide [3 MARKS]

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