Question

Hydrogen chloride gas turns the blue litmus paper:

A

green

B

red

C

black

D

no change in colour

Easy

Solution

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Correct option is
D

no change in colour

The colour of blue litmus paper changes only in the presence of ions like hydrogen () or hydronium () ions. HCl can produce these ions only when in the form of an aqueous solution. 

Hence dry HCl gas does not change the colour of dry litmus paper.

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