JEE Main 2012 — Electrochemistry Question with Solution
JEE Main 2012 (Offline)
Question
The standard reduction potentials for , and are and respectively. The reaction will be spontaneous when:
Choose an option
Show full solutionCorrect option: D
Correct answer
D
Step-by-step explanation
$\begin{aligned}
& \mathrm{Zn}+\mathrm{Fe}^{+2} \rightarrow \mathrm{Zn}^{+2}+\mathrm{Fe} \\
& \mathrm{Fe}+\mathrm{Ni}^{+2} \rightarrow \mathrm{Fe}^{2+}+\mathrm{Ni} \\
& \mathrm{Zn}+\mathrm{Ni}^{2+} \rightarrow \mathrm{Zn}^{+2}+\mathrm{Ni}
\end{aligned}$
All these are spontaneous
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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.