Copper sulphate when reacts with iron, changes its colour from blue to green. This is a:

chemical change

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physical change

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both A and B

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neither A nor B

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Solution

The correct option is D chemical change
$F e (s) + C u S O_{4} (a q) \to C u (s) + F e S O_{4} (a q) .$
Blue colour is due to $C u S O_{4}$ and green colour is due to $F e S O_{4}$ , since new compound is formed in this change hence this is chemical change.

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