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Why does dry HCl gas not change the colo...

Why does dry HCl gas not change the colour of the dry litmus paper?

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Dry HCl gas does not show acidic character due to absence of `H^(+)` ions and therefore , does not change the colour of the dry litmus paper .
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MTG IIT JEE FOUNDATION-ACIDS , BASES AND SALTS -NCERT Section
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