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Question

Vishakha takes a few wire pieces made up of different metals and places them in a blue solution of copper sulphate. What changes does she observe in the colour of the solutions present in beakers I, II, and III?


A
I - Blue; II - Blue; III - Blue
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B
I - Green; II - Blue; III - Green
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C
I - Green; II - Blue; III - Blue
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D
I - Blue; II - Green; III - Green
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Solution

The correct option is C I - Green; II - Blue; III - Blue
As iron is more reactive than copper, it displaces copper from copper sulphate solution. A green solution of iron sulphate is formed.
Fe+CuSO4FeSO4+Cu

Silver and gold are less reactive than copper. So, they do not displace copper from copper sulphate solution. Hence, the solution remains blue in colour.

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