Blue coloured 'X' changes to white coloured 'Y' on heating. In the presence of the moisture, 'Y' gives blue coloured 'X'. This is because of ___.

X is NaCl

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X is bleaching powder

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X has some water of crystallization

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None of these

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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 colour and become 'Y' (anhydrous). Again when 'Y' is moistened i.e., reacted with water, 'X' takes some water molecule as the water of crystallization and blue colour reappears.

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Similar questions

_{A drop of water is poured over a white powdery substance. Then it is observed that the substance turns blue. Answer the following questions :}

_{(i) What is the white powdery substance?}

_{(ii) Why does the substance change to blue colour?}

_{(iii) Write the chemical formula of the blue substance .}

_{(iv) Is the blue substance an acidic salt or a basic salt?}

_{(v) Give a reason for your answer in (iv).}

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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