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Iron fillings are put in different test-tubes A, B, C and D containing ZnSO4, CuSO4, AI2(SO4)3, CaCl2 solutions respectively.

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Iron fillings are put in different test-tubes A, B, C and D containing ZnSO4, CuSO4, AI2(SO4)3, CaCl2 solutions respectively. In which of the following test-tubes change will be observed?

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In test-tube B change will be observed because iron is more reactive than copper and it will displace Cu from CuSO4. 

CuSO4 + Fe → FeSO4 + Cu.

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