_________ paper is used to check the presence of moisture.

Sodium Chloride

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Blue Litmus

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Red Litmus

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Cobalt Chloride

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Solution

The correct option is D Cobalt Chloride
Cobalt chloride paper is used to check the presence of moisture. When dry, the paper is blue in colour. When the humidity increases or the paper becomes wet. Then the paper turns pink.

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Which solvent can be used to obtain sodium chloride from a mixture of sodium chloride and sulphur without using water?

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