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STD 12 - 2. Electrochemistry — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 12 - 2. Electrochemistry4 Marks
MCQ
$E _{ Cu ^{2+} \mid Cu }^{\circ}=+0.34 V$

$E _{ Zn ^{2}+\mid Zn }^{ o }=-0.76 V$

Identify the incorrect statement from the options below for the above cell 

  • ✓
    If $E _{ ext }>1.1\, V , Zn$ dissolves at $Zn$ electrode and $Cu$ deposits at $Cu$ electrode
  • B
    If $E _{\text {ext }}>1.1\, V , e ^{-}$ flows from $Cu$ to $Zn$
  • C
    If $E _{ ext }=1.1 \,V ,$ no flow of e $^{-}$ or current occurs
  • D
    If $E _{\text {ext }}<1.1\, V , Zn$ dissolves at anode and $Cu$ deposits at cathode
✓

Answer

Correct option: A.
If $E _{ ext }>1.1\, V , Zn$ dissolves at $Zn$ electrode and $Cu$ deposits at $Cu$ electrode
a
$E _{\text {cell }}^{\circ}=0.34-(-0.76)$

$\quad=1.10$ volt

If $E _{\text {ext }}>1.10$ volt

$Cu \rightarrow$ Anode

$Zn \rightarrow$ Cathode

If $E _{\text {ext }}=1.10\, volt$

$Zn \rightarrow$ Anode

$Cu \rightarrow$ Cathode

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