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When ferrous sulphate crystals (FeSO4.7H2O) are heated, what happens first?

Question
When ferrous sulphate crystals (FeSO4.7H2O) are heated, what happens first?
They immediately turn into iron metal
They lose water and their colour changes
They explode without any colour change
They turn into ferrous sulphate gas
Answer
They lose water and their colour changes
Detailed Explanation
On heating, the ferrous sulphate crystals first lose their water of crystallisation and the colour of the crystals changes.
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