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Q.

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

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a

Dry blue litmus paper turns red for dry HCl gas.

b

Dry blue litmus paper turns green for dry HCl gas.

c

Dry blue litmus paper turns red for HCl solution.

answer is B.

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Detailed Solution

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