When the sample of copper wth zinc impurity is to be purified by electrolysis, the appropriate electrodes are

  • Option 1)

    cathode          anode

    pure zinc        pure copper

  • Option 2)

    cathode                  anode

    impure sample         pure copper

  • Option 3)

    cathode              anode

    mpure zinc      impure sample

  • Option 4)

    cathode          anode

    pure copper      impure sample.

 

Answers (1)

As we learnt in 

Electrolytic Refining -

Many of the metals such as Cu,Au,Ag,Al,Hb etc are purified by this method.

- wherein

The impure metal is made anode while a thin sheet of pure metal acts as a cathode. 

 

 Impure metal is taken as anode as it dissolves while pure metal deposits on cathode after reduction of metal cations

 


Option 1)

cathode          anode

pure zinc        pure copper

This option is incorrect

Option 2)

cathode                  anode

impure sample         pure copper

This option is incorrect

Option 3)

cathode              anode

mpure zinc      impure sample

This option is incorrect

Option 4)

cathode          anode

pure copper      impure sample.

This option is correct

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