Question

dry hydrogen chloride gas does not turn blue litmus red where as dilute hydrochloric acid

Answer 1

Litmus is turned turned red by arhenius acids because of their H+ ions . HCl is an acid because it dissoaciates to give H+ ions but only in aqueouasolutionsi.Dry HCl does not give H+ ions. ... HCl can produce these ions only in the form of aqueous solution. Hence dry HCl gas does not change the colour of dry litmus paper.

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Answer 2

This is so dry hydrogen do not dissociate H+ions, whereas dilute does. This is because for dissociation of H+ions it requires aqueous solution .Thus dry hydrogen chloride gas do not turn litmus inti red while dilute dryhydrochloric acid does.