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On immersing an iron nail in CuSO4 solution for few minutes, you will observe – (a) No reaction takes place

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On immersing an iron nail in CuSO4 solution for few minutes, you will observe –

(a) No reaction takes place 

(b) The colours of solution fades away 

(c) The surface of iron nails acquire a black coating 

(d) The colour of solution changes to green

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(d) the colour of solution changes to green

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