Sign in
12thPass logo
New chatPYQ LibraryDoubtsRank report
Sign in to see Recents

Your guest activity stays on this device

Sign in to save progress →
Sign in

Electrochemistry question

2025 · 29 Jan · Shift 2 · Q9
Guest · filters and generic practice availableBrowsing as a guest · PYQ filters and generic practice are available. Sign in only for personalised features and saved progress.
  1. PYQ Library
  2. /JEE Main
  3. /Chemistry
  4. /Electrochemistry
  5. /2025 · 29 Jan · Shift 2 · Q9

Electrochemistry question

2025 · 29 Jan · Shift 2 · Q9

JEE MainChemistryElectrochemistryMCQ+4 / −1

Match List - I with List - II :

List - I (Applications) List - II (Batteries/Cell)
(A) Transistors (I) Anode - Zn/Hg; Cathode - HgO + C
(B) Hearing aids (II) Hydrogen fuel cell
(C) Inverters (III) Anode - Zn; Cathode - Carbon
(D) Apollo space ship (IV) Anode - Pb; Cathode - Pb | PbO2

Choose the correct answer from the options given below :

  1. A
    (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
  2. B
    (A)-(II), (B)-(III), (C)-(IV), (D)-(I)
  3. C
    (A)-(IV), (B)-(III), (C)-(II), (D)-(I)
  4. D
    (A)-(III), (B)-(II), (C)-(IV), (D)-(I)
View written solutionFree

Correct answer: A

  1. Identify each battery/cell in List-II

    • (I) Anode = Zn/Hg; Cathode = HgO + C
      This is a mercury cell.
    • (II) Hydrogen fuel cell
      Used where continuous high-efficiency power is needed, especially in space missions.
    • (III) Anode = Zn; Cathode = Carbon
      This is the dry cell (Leclanche cell).
    • (IV) Anode = Pb; Cathode = Pb ∣\mid∣ PbO2_22​
      This is the lead storage battery.

  2. Match applications from List-I

    (A) Transistors

    Transistor radios and similar small devices traditionally use dry cells.
    So, (A)→(III)(A) \to (III)(A)→(III)

    (B) Hearing aids

    Hearing aids commonly use mercury cells because they provide nearly constant potential and are compact.
    So, (B)→(I)(B) \to (I)(B)→(I)

    (C) Inverters

    Inverters use lead storage batteries.
    So, (C)→(IV)(C) \to (IV)(C)→(IV)

    (D) Apollo space ship

    Apollo spacecraft used hydrogen-oxygen fuel cells.
    So, (D)→(II)(D) \to (II)(D)→(II)

  3. Final matching

    (A)−(III),(B)−(I),(C)−(IV),(D)−(II)(A)-(III),\quad (B)-(I),\quad (C)-(IV),\quad (D)-(II)(A)−(III),(B)−(I),(C)−(IV),(D)−(II)

  4. Compare with options

    This corresponds to Option A.

  5. Comparison with stored answer

    Stored correct answer = A
    Derived answer = A
    Hence, they agree.

PreviousNext

More from Electrochemistry

  • The potential for the given half cell at 298 K is (-) ​×10−2 V ​2H(aq)+​+2e−⟶H2​( g)[H+]=1M,PH2​​=2 atm​…2024 · Numerical
  • The amount of electricity in Coulomb required for the oxidation of 1 mol of H2​O to O2​ is ​×105C.2024 · Numerical
  • Consider the following redox reaction : MnO4−​+H++H2​C2​O4​⇌Mn2++H2​O+CO2​ The standard reduction potentials are given as…2024 · Numerical
  • One of the commonly used electrode is calomel electrode. Under which of the following categories, calomel electrode comes?2024 · MCQ
  • What pressure (bar) of H2​ would be required to make emf of hydrogen electrode zero in pure water at 25∘C ?2024 · MCQ
  • Fuel cell, using hydrogen and oxygen as fuels, A. has been used in spaceship B. has as efficiency of 40% to produce electricity C. uses aluminum as catalysts D. is eco-friendly E. is actually a type of Galvanic cell only Choose the…2024 · MCQ
  • For a strong electrolyte, a plot of molar conductivity against (concentration) 1/2 is a straight line, with a negative slope, the correct unit for the slope is2024 · MCQ
  • Molar ionic conductivities of divalent cation and anion are 57 S cm2 mol−1 and 73 S cm2 mol−1 respectively. The molar conductivity of solution of an electrolyte with the above cation and…2024 · MCQ