When the stopper of a bottle full of hydrogen chloride liquid is opened, fumes can be seen coming out. Why does this happen?

Hydrogen chloride is a noble gas.

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There is an immediate reaction between hydrogen chloride gas and water vapour in the air.

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It reacts with the bottle to release fumes.

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HCl is a weak acid.

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Solution

The correct option is B
There is an immediate reaction between hydrogen chloride gas and water vapour in the air.

HCl is a gas at room temperature. Inside the bottle, it is present as a liquid. When the stopper of a bottle is opened, HCl gas escapes and comes in contact with water vapour present in the atmosphere, and forms white fumes of hydrochloric acid.

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Similar questions

When the stopper of a bottle full of hydrogen chloride gas is opened, fumes can be seen coming out. Why does this happen?

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. Explain why? [5 MARKS]
(a) Anhydrous HCl is a poor conductor while aq. HCl is an excellent conductor of electricity.
(b) Only a very dilute solution of hydrogen chloride in water can be concentrated by boiling the solution while a very concentrated solution would become less concentrated when boiled.
(c) When the stopper of a bottle full of hydrogen chloride gas is opened, there are fumes in the air.

Explain, why (or give reasons for)
(i) In the laboratory preparation of hydrogen chloride from sodium chloride, the gas can be obtained below 200°C or above. But the lower temperature is preferred.
(ii) Hydrogen chloride is not collected over water.
(iii) Hydrochloric acid cannot be concentrated above 22.2% by boiling.
(iv) HCl gas does not conduct electricity, but hydrochloric acid conducts electricity.
(v) Only a very dilute solution of hydrogen chloride in water can be concentrated by boiling the solution while a very concentrated solution would become less concentrated when boiled.
(vi) When the stopper of a bottle full of HCl gas is opened there are fumes in the air.
(vii) A solution of HCl gas in water turns blue litmus red and conducts electricity, while HCl gas dissolves in toluene and it has no effect on litmus and does not conduct electricity.
(viii) An aqueous solution of chlorine is acidic in nature.

Q. Explain the following: [5 MARKS]
(a) 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.
(b) Dry Hydrogen chloride gas does not affect a dry strip of blue litmus but turns red in the presence of a drop of water.
(c) Hydrogen Chloride gas is not collected over water.

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