Blue coloured X changes to white colored Y on heating and in the presence of the moisture Y gives blue colored X. This is because ___.

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 of crystallization. When X is heated, the water molecules disappear and X loses its blue color and becomes Y (anhydrous). Again when Y is moistened i.e. reacted with water, X takes some water molecule as water of crystallization and blue color reappears.

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Blue color X changes to white color Y on heating and when we moisten Y, Blue color X reappers. This is because has some water of crystallisation.

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