Which of the following is the reasoning due to which dry $HCl$ gas does not change the colour of a dry blue litmus paper?

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HCl

lacks in hydronium ion

HCl

have hydronium ion

HCl

have hydroxide ion

HCl

lacks in hydroxide ion

answer is A.

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Detailed Solution

Dry

HCl

gas doesn't contain hydronium ions so it doesn’t change the colour of a dry blue litmus paper.
The acidic nature of the solution is described by the presence of hydrogen/hydronium ions in it. Hydronium ion is absent in dry

HCl

gas. Due to the absence of hydronium ion in dry

HCl

gas, it does not act as an acid. As it does not behave as acid, when blue litmus paper is treated with dry

HCl

gas, the colour is not changed to red as it does not possess the properties of an acid. Therefore, the colour of the blue litmus paper is not changed.

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