What happens when a dry red litmus paper is touched to base powder?

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The colour of litmus paper vanishes out

Litmus paper turns green

No change in the colour of the litmus paper

Litmus paper turns red

answer is D.

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Detailed Solution

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

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