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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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Knowledge Check

  • When a zinc metal strip is placed in a copper sulphate solution the blue colour of the solution fades and copper is deposited on the zinc strip as red - brown crust. The oxidation half cell reaction of the above process is represented as _________.

    A
    `Cu_((aq))^(2+)+2e^(-) rarr Cu_((s))`
    B
    `Cu_((s)) rarr Cu^(2+)+2e^(-)`
    C
    `Zn_((s)) rarr Zn_((aq))^(2+)+2e^(-)`
    D
    `Zn_((aq))^(2+)+2e^(-) rarr Zn_((s))`

  • 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.

    A
    Both (A) and (R) are correct but (R) is not the correct explanation of (A)
    B
    Both (A) and (R) are correct and (R) is the correct explanation of (A).
    C
    (A) is correct but (R) is wrong.
    D
    (A) is wrong but (R) is correct

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