A student took four test-tubes I, II, III and IV containing aluminium sulphate, copper sulphate, ferrous sulphate and zinc sulphate solutions respectively. He placed iron strips in each one of them. After some time, he found a brown deposit formed in test-tube marked :


(1) I
(2) II
(3) III
(4) IV

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Correct answer:  (2) II

Explanation: Test-tube II- As iron is more reactive than copper, so it will displace copper from the copper sulphate solution. Due to this, the colour of the solution changes from blue to green and iron nail becomes brown due to the deposition of copper on its surface.

The chemical equation for the reaction is given below:

$Fe (Grey) (s) + CuSO_4 (Blue) (aq) → FeSO_4 (Green) (aq) + Cu (Brown) (s)$

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Updated on: 10-Oct-2022

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