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How can dry blue litmus paper differentiate between dry HCl gas and HCl solution?

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Dry blue litmus paper turns red for dry $HCl$ gas.

Dry blue litmus paper turns red for $HCl$ solution.

Dry blue litmus paper turns green for dry $HCl$ gas.

answer is B.

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Detailed Solution

A blue litmus paper turns red in presence of an acidic solution. It changes colour in presence of hydrogen ions but in the case of dry $HCl$ gas, it does not dissociate giving hydrogen ions. Thus, there is no colour change for dry $HCl$ gas.

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