JEE Main 2020 — Electrochemistry Question with Solution
From: JEE Main 2020 (Online) 7th January Morning Slot
Question
Given that the standard potentials (Eo) of Cu2+/Cu and Cu+/Cu are 0.34 V and 0.522 V respectively, the Eo of Cu2+/Cu+ :
Choose an option
Show full solutionCorrect option: D
Correct answer
D+0.158 V
Step-by-step explanation
Cu+2 + 2e– Cu Eo = 0.34 V ....(1)
Cu+ + e– Cu Eo = 0.522 V
Cu Cu+ + e– Eo = -0.522 V ...(2)
By adding (1) and (2) we get,
Cu+2 + e– Cu+
Eocell = = 0.158 V
Cu+ + e– Cu Eo = 0.522 V
Cu Cu+ + e– Eo = -0.522 V ...(2)
By adding (1) and (2) we get,
Cu+2 + e– Cu+
Eocell = = 0.158 V
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This is a previous-year question from JEE Main 2020, 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.