Match the following columns.
Column I Column II
A $Zn + {Cu}^{2 +} ⟶ Cu + {Zn}^{2 +}$ p Cathode half reaction is ${Cu}^{2 +} + 2 e^{-} ⟶ Cu$
B $Mg + {Cu}^{2 +} ⟶ Cu + {Mg}^{2 +}$ q Electrons flows from metal to Cu side.
C $2 {Ag}^{+} + Cu ⟶ {Cu}^{2 +} + 2 Ag$ r $E_{anode}^{\circ} < E_{cathode}^{\circ}$
D $H_{2} + {Cu}^{2 +} ⟶ H^{+} + Cu$ s Hydrogen electrode is used

Moderate

Solution

$A \to p, q, r; B \to p, q, r; C - r; D \to p, r, s$
Hydrogen is not a metal.

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	Column I		Column II
A	$Zn + {Cu}^{2 +} ⟶ Cu + {Zn}^{2 +}$	p	Cathode half reaction is ${Cu}^{2 +} + 2 e^{-} ⟶ Cu$
B	$Mg + {Cu}^{2 +} ⟶ Cu + {Mg}^{2 +}$	q	Electrons flows from metal to Cu side.
C	$2 {Ag}^{+} + Cu ⟶ {Cu}^{2 +} + 2 Ag$	r	$E_{anode}^{\circ} < E_{cathode}^{\circ}$
D	$H_{2} + {Cu}^{2 +} ⟶ H^{+} + Cu$	s	Hydrogen electrode is used