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Question

What happens to blue litmus paper when it is dipped in vinegar?

A
It turns red.
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B
It turns dark blue.
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C
It turns black.
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D
It turns green.
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Solution

The correct option is A It turns red.
Litmus is an acid-base indicator which changes its colour when exposed to an acidic or basic solution. Blue litmus paper turns red in an acidic solution and red litmus paper turns blue in a basic solution. Since vinegar is acidic, it turns blue litmus paper to red.

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