When a litmus solution is shaken with a piece of charcoal.

it is decolourised

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it turns red to blue

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it turns blue to red

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none of these

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Solution

The correct option is A it is decolourised
When a solution of acetic acid in water is shaken with charcoal, a part of the acid is adsorbed by the charcoal and the concentration of the acid decreases in the solution. Similarly, the litmus solution when shaken with charcoal becomes colourless.
Option A is correct answer.

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