What happens when a dry blue litmus paper is touched to acid powder?

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Litmus paper turns red

Litmus paper turns green

The colour of litmus paper vanishes out

No change in the colour of the litmus paper

answer is D.

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Detailed Solution

The acid powder does not change the colour of litmus paper. If blue litmus paper is dipped in the aqueous acid solution then only blue litmus paper turns red. Water is necessary to change the colour of litmus paper because acid dissociates hydrogen ions in an aqueous solution.

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