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Which of the following does not occur, when a rod of Zn metal is dipped in an aqueous solution of CuSO4

(a)  blue colour of the oxygen fades gradually.

(b)  weight of Zn–metal rod decreases.

(c)  weight of metal strip of zinc increases.

(d)  colour of the surface of Zn road become saffron–red.

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(c) weight of metal strip of zinc increases.

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