Question

dry hcl doesnot change its colour on litmus paper

Answer 1

dry HCL gas does not contain any hydrogen ions in it so it does not show acidic behaviour in fact dry HCL gas does not change the colour of dry Litmus Paper as it has no hydrogen ions in it

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Answer 2

We know that the colour of litmus paper is changed by H + ions because of acid.

Dry HCL it does not dissociate to give H+ ions.

Acids dissociate to give ions only in the aqueous solution.

In this HCL is not in aqueous form nor litmus paper is wet, so the colour of litmus paper does not change.