Match commercial cells and batteries with their uses, electrodes or reactions

This type of question, asked 3 times: 28 Jul 2022, 9 Apr 2024, 29 Jan 2025. All 3 questions below, oldest first.

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Question 1

28 Jul 2022

Cd(s) + 2Ni(OH)_{3}(s) \rightarrow CdO(s) + 2Ni(OH)_{2}(s) + H_{2}O(l)

	List-I		List-II
(A)	$Cd(s) + 2Ni(OH)_{3}(s) \rightarrow CdO(s) + 2Ni(OH)_{2}(s) + H_{2}O(l)$	(I)	Primary battery
(B)	$Zn(Hg) + HgO(s) \rightarrow ZnO(s) + Hg(l)$	(II)	Discharging of secondary battery
(C)	$2PbSO_{4}(s) + 2H_{2}O(l) \rightarrow Pb(s) + PbO_{2}(s) + 2H_{2}SO_{4}(aq)$	(III)	Fuel cell
(D)	$2H_{2}(g) + O_{2}(g) \rightarrow 2H_{2}O(l)$	(IV)	Charging of secondary battery

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9 Apr 2024

126

Zn \rightarrow Zn^{2 +}+ 2e^{-}

	List-I (Cell)		List-II (Use/Property/Reaction)
A.	Leclanche cell	I.	Converts energy of combustion into electrical energy
B.	Ni-Cd cell	II.	Does not involve any ion in solution and is used in hearing aids
C.	Fuel cell	III.	Rechargeable
D.	Mercury cell	IV.	Reaction at anode $Zn \rightarrow Zn^{2 +}+ 2e^{-}$

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29 Jan 2025

110

PbO_{2}

	List-I (Application)		List-II (Battery/Cell)
(A)	Transistors	(I)	Anode -Zn/Hg; Cathode -HgO + C
(B)	Hearing aids	(II)	Hydrogen fuel cell
(C)	Invertors	(III)	Anode - Zn ; Cathode - Carbon
(D)	Apollo space ship	(IV)	Anode - Pb ; Cathode - $PbO_{2}$ on a lead grid

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