Blue colored X changes to white colored Y on heating and in the presence of the moisture Y gives blue colored X. What is X likely to be?

X is NaCl

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X is the bleaching powder

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X has some water of crystallization

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None of the above

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Solution

The correct option is C X has some water of crystallization
This is because X has some water crystallization. When X is heated, the water molecules disappear and X loses its blue color and become anhydrous Y(contains no water). Again when Y is hydrated, X takes some water molecules which is called water of crystallization and the blue color reappears.

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