Question

why does dry HCL gas not change the colour of dry litmus paper??​

Answer 1

Answer:

because it doesn't have h+ ions in dry state.

when it mixes with water it ionises to form h+ions

Explanation:

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Answer 2

Answer:

This is under normal conditions, not anhydrous conditions. 

Dry Hcl gas does not contain any hydrogen ions in it, so itdoes not show acidic behaviour. Dry HCl gas does not change the colour of dry litmus paper as it has no hydrogen ions [H+(aq) ions] in it. ... And changes the color of litmus paper to RED.