JEE Main 2020 — Electrochemistry Question with Solution
From: JEE Main 2020 (Online) 8th January Evening Slot
Question
For an electrochemical cell
Sn(s) | Sn2+ (aq,1M)||Pb2+ (aq,1M)|Pb(s)
the ratio when this cell attains equilibrium is _________.
(Given ,
, )
Sn(s) | Sn2+ (aq,1M)||Pb2+ (aq,1M)|Pb(s)
the ratio when this cell attains equilibrium is _________.
(Given ,
, )
Enter your answer
Show full solutionCorrect answer: 2.15
Correct answer
2.15
Step-by-step explanation
Cell reaction is :
Sn(s) + Pb+2(aq) Sn+2(aq) + Pb(s)
Apply Nernst equation :
Ecell = - ....(1)
= -0.13 + 0.14 = 0.01 V
At equilibrium : Ecell = 0
Substituting in (1), we get
0 = 0.01 -
=
= 2.15
Sn(s) + Pb+2(aq) Sn+2(aq) + Pb(s)
Apply Nernst equation :
Ecell = - ....(1)
= -0.13 + 0.14 = 0.01 V
At equilibrium : Ecell = 0
Substituting in (1), we get
0 = 0.01 -
=
= 2.15
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