Blue coloured X changes to white coloured Y on heating and in the presence of the moisture Y gives blue coloured X. What is X likely to be?
A
X has some organic contents
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B
X is the bleaching powder
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C
X is NaCl
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D
X has some water of crystallisation
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Solution
The correct option is D X has some water of crystallisation This is because X has some water of crystallisation. When X is heated, it loses water of crystallisation and become anhydrous Y. Again on moistening Y, it regains its blue colour forming hydrated X.