When iron filings are added to copper sulphate solution, confirms the occurrence of a chemical change.

evolution of gas

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formation of ppt

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change in colour

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Solution

The correct option is C change in colour
The copper sulphate solution is blue in colour. When iron reacts with it, the solution gradually obtains green colour due to the formation of ferrous sulphate.
$Fe(s) + {CuSO}_{4} (aq) \to {FeSO}_{4} (aq) + Cu (s)$

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When iron fillings are added to a blue coloured copper sulphate solution, what colour change would you observe in solution?

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