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Electrochemistry question

2021 · 26 Feb · Shift 1 · Q9
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  5. /2021 · 26 Feb · Shift 1 · Q9

Electrochemistry question

2021 · 26 Feb · Shift 1 · Q9

JEE MainChemistryElectrochemistryMCQ+4 / −1
Compound A used as a strong oxidizing agent is amphoteric in nature. It is the part of lead storage batteries. Compound A is :
  1. A
    PbO
  2. B
    PbO2PbO_2PbO2​
  3. C
    PbSO4PbSO_4PbSO4​
  4. D
    Pb3O4Pb_3O_4Pb3​O4​
View written solutionFree

Correct answer: B

  1. Identify the clues from the question

    We need a lead compound that:

    1. is a strong oxidizing agent,
    2. is amphoteric in nature,
    3. is used in lead storage batteries.

  2. Recall the compounds involved in lead-acid battery

    In a lead storage battery:

    • Anode (negative plate): Pb
    • Cathode (positive plate): PbO2PbO_2PbO2​
    • Electrolyte: H2SO4H_2SO_4H2​SO4​

    So a major compound used in lead storage batteries is lead dioxide, PbO2PbO_2PbO2​.

  3. Check oxidizing nature

    PbO2PbO_2PbO2​ is a well-known strong oxidizing agent.

    For example, in acidic medium it gets reduced from lead in the +4+4+4 oxidation state to lead in the +2+2+2 oxidation state.

  4. Check amphoteric nature

    PbO2PbO_2PbO2​ shows amphoteric character because it reacts with both acids and bases.

  5. Evaluate the options

    A: PbOPbOPbO

    • Amphoteric oxide, but not the strong oxidizing agent used as the active oxidizing material in lead storage batteries.
    • Not correct.

    B: PbO2PbO_2PbO2​

    • Strong oxidizing agent
    • Amphoteric
    • Used as the positive plate material in lead storage batteries
    • Correct.

    C: PbSO4PbSO_4PbSO4​

    • Formed during battery discharge, but not the oxidizing agent referred to here.
    • Not correct.

    D: Pb3O4Pb_3O_4Pb3​O4​

    • Red lead, not the standard active oxidizing compound in lead storage batteries.
    • Not correct.

  6. Final answer

    Therefore, compound AAA is: PbO2\boxed{PbO_2}PbO2​​

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