JEE Main 2012 — Electrochemistry Question with Solution
From: AIEEE 2012
Question
The standard reduction potentials for Zn2+/ Zn, Ni2+/ Ni, and Fe2+/ Fe are –0.76, –0.23 and –0.44 V respectively. The reaction
X + Y2+ X2+ + Y will be spontaneous when :
X + Y2+ X2+ + Y will be spontaneous when :
Choose an option
Show full solutionCorrect option: D
Correct answer
DX = Zn, Y = Ni
Step-by-step explanation
For a spontaneous reaction must be
Since
Hence for to be has to be positive.
Which is possible when
(positive).
Since
Hence for to be has to be positive.
Which is possible when
(positive).
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This is a previous-year question from JEE Main 2012, covering the Electrochemistry chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.