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JEE Advanced 2021 Paper 2

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Question : 23

Total: 57

Some standard electrode potentials at 298K are given below:
Pb2+/Pb‌−0.13V
Ni2+∕Ni‌−0.24V
Cd2+/Cd‌−0.40V
Fe2+/Fe‌−0.44V
To a solution containing 0.001M of X2+ and 0.1M of Y2+, the metal rods X and Y are inserted (at 298K ) and connected by a conducting wire. This resulted in dissolution of X. The correct combination(s) of X and Y, respectively, is (are) (Given: Gas constant, R=8.314JK−1mol−1, Faraday constant, F=96500Cmol−1 )

Cd and Ni
Cd and Fe
Ni and Pb
Ni and Fe

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