Question

Dry HCL gas does not change the colour of dry blue litmus paper why?
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Answer 1

Answer:

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

Answer 2

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