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Standard electrode potentials of three metals X, Y and Z are −1.2 V, +0.5 V and −3.0 V respectively. The reducing power of these metals will be
A
X > Y > Z
B
Y > Z > X
C
Y > X > Z
D
Z > X > Y
Detailed Solution
A reducing agent is itself oxidised. The lower (more negative) the standard reduction potential of a metal, the more easily it is oxidised and the stronger it is as a reducing agent.
Reduction potentials: Z = −3.0 V, X = −1.2 V, Y = +0.5 V.
Increasing order of reduction potential: Z < X < Y.
Reducing power is the reverse of this order.
Hence the reducing power is Z > X > Y.
Reduction potentials: Z = −3.0 V, X = −1.2 V, Y = +0.5 V.
Increasing order of reduction potential: Z < X < Y.
Reducing power is the reverse of this order.
Hence the reducing power is Z > X > Y.