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Question

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

A
it is decolourised
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B
it turns red to blue
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C
it turns blue to red
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D
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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