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what's happened when Zinc dust is added ...

what's happened when Zinc dust is added to copper sulphate solution.?

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(i) When a piece of zinc metal is added to copper sulphate solution, more reactive zinc metal displaces the less reactive copper from copper sulphate solution and a solution of zinc sulphate is obtained while copper gets deposited on zinc making it reddish brown in colour.
(ii) `Zn_((s))+CuSO_(4(aq))to ZnSO_(4(aq))+Cu_((s))`
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Assertion (A): Zinc metal when placed in copper sulphate solution, zinc turns brown. Reason (R): Due to metal displacement reaction, copper sulphate reacts with zinc, Cu gets deposited over zinc and so it turns brown.

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