Red litmus paper turns ______, when it is placed in limewater.

green

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blue

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black

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yellow

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Solution

The correct option is B blue
Litmus paper is an indicator which is used to find if a substance is an acid or a base.
Blue litmus paper turns red when it is placed in an acidic solution. Red litmus paper turns blue when it is placed in a basic solution.
Limewater is a common name for calcium hydroxide which is a base. Hence, red litmus paper turns blue when placed in limewater.

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