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Consider following sets : Blue colo...

Consider following sets `:`

Blue colour solution changes to colourless ( or fades ) in

A

`I,II,III`

B

`I,II`

C

`II,III`

D

`I,III`

Text Solution

Verified by Experts

The correct Answer is:
4
Since`Zn,Fe` is above in Electrochemical gases ( better reducing agent ) thus it replaces Cu from solution.
`Zn+CuSO_(4)rarrZnSO_(4)+Cu`
`Fe+CuSO_(4)rarrFeSO_(4)+Cu`
Thus `(1)` and `(3)` solution becomes colour less.
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