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CGP EDU Academic Team
Published on: August 14, 2026
The standard reduction potential for Zn +2 /Zn ; Ni +2 /Ni ; and Fe +2 /Fe are –0.76V, –0.23V, –0.44V respectively. The reaction X + Y +2 ⎯→ X +2 + Y will be non-spontaneous when :
X Y
(I) Ni Fe
(II) Ni Zn
(III) Fe Zn
(VI) Zn Ni
Text Solution
Verified by ExpertsThe correct answer is:
B
Zn + Ni +2 ⎯→ Zn +2 + Ni
Eº = 
– 
= –0.23 – (–0.76) = + 0.53 V
Positive value shows that the process is spontaneous.
Rest of all (I) (II) (III) combination have negative Eº value.
(I) Eº = –0.44 – (–0.23) = –0.21 V
(II) Eº = –0.76 – (–0.23) = –0.53 V
(III) Eº = –0.76 – (–0.44) = –0.32 V
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