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Match the items of column I and column II
Column I Column II
A Lechlanche cell P
Overall cell reaction
$2 H_{2} (g) + O_{2 (g)} \to 2 H_{2} O (l)$
B Ni – Cd cell Q Does not involve any ion in solution and is used in hearing aids.
C Fuel cell R Rechargeable
D Mercury cell S
Reaction at cathode:
Zn(Hg) + 2OH^- $\overset{}{\to}$ Zno + H₂O + 2e^-
T Reaction at anode $Zn (s) \to {Zn}^{2 +} + 2 e^{-}$

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$A - Q, B - T, C - R, D - S$

$A - T, B - R, C - P, D - Q$

$A - S, B - T, C - R, D - S$

$A - P, B - R, C - Q, D - S$

answer is A.

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Detailed Solution

Match the items of column I and column II

	Column I	Column II
A	Lechlanche cell	Reaction at anode $Z n \to Z n^{2 +} + 2 e^{-}$
B	Ni – Cd cell	Rechargeable
C	fuel cell	Overall cell reaction $2 H_{2} + O_{2} \to 2 H_{2} O$
D	Mercury cell	does not involve any ion in solution and is used in hearing aids

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