JEE Main · 2021 · 26 Feb 2021 · Shift 1 · p-Block Elements

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Compound A used as a strong oxidizing agent is amphoteric in nature. It is the part of lead storage batteries. Compound A is :

(A) $PbSO_{4}$
(B) $Pb_{3} O_{4}$
(C)PbO
(D) $PbO_{2}$ ✓ Correct

Answer: (D)

Solution

In a lead storage cell the negative plate is spongy lead and the positive plate is lead dioxide. During discharge the lead dioxide is reduced to lead sulphate, which is the strong oxidising action referred to:

Pb O_{2} + S O_{4}^{2 -} + 4 H^{+} + 2 e^{-} \to PbS O_{4} + 2 H_{2} O

Lead dioxide dissolves in concentrated acid to give lead(IV) salts and in hot alkali to give plumbates, so it is amphoteric.
Compound A is

Pb O_{2}

JEE Main · 2021 · 26 Feb 2021 · Shift 1 · Single correct option

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