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Q.

When crystals of ${FeSO}_{4}$ are strongly heated, the residue obtained is

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a

green in colour

b

blue in colour

c

Colourless

d

red in colour

answer is A.

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Detailed Solution

Because decomposition reaction takes place to form
${Fe}_{2} O_{3} and {SO}_{2} and {SO}_{3}$

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