CBSE Class 10 Science Exam 2014 Term 1 Paper

Question : 34

Total: 36

An iron nail is dipped in the solution of copper sulphate for about 30 minutes, state the change in colour observed. Give the reason for the change.

Solution:

Iron is more reactive than Cu. So it displaces Cu from copper sulphate solution. Thus, blue colour of the CuSO4 solution fades and colour of the solution turns green due to the formation of ferrous sulphate solution. This is a displacement reaction.

CuSO4(aq)

(Blue)

+Fe( s)→

FeSO4(aq)

(Green)

+Cu( s)

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