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Question

During the electrolysis of molten lead bromide which of the following takes place


A

Bromine is released at the cathode

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B

Lead is deposited at the anode

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C

Bromine ions gain electrons

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D

Lead is deposited at the cathode

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Solution

The correct option is D

Lead is deposited at the cathode


The explanation for the correct option:

(D) Lead is deposited at the cathode:

During the electrolysis of molten Lead bromide (PbBr2),

  • Reaction at the anode:

At the anode, the bromide ion loses electrons to release bromine.

2Br-(aq)Br2(aq)+2e-

  • Reaction at Cathode:

At the cathode, the lead ion undergoes reduction by gaining two electrons.

Pb+2(aq)+2e-Pb(aq)

During electrolysis of lead bromide, bromine is released at the anode and lead is deposited at the cathode.

The explanation for the incorrect option:

(A) Bromine is released at the cathode: Bromine is released at the anode, during the electrolysis of molten lead bromide. This option is wrong.

(B) Lead is deposited at the anode: Lead is deposited at the cathode. Thus the option is wrong.

(C) Bromine ions gain electrons: Bromide ion loses electrons to form bromine. Thus the option is wrong

Therefore, option (D) is correct. i.e., during the electrolysis of molten Lead bromide lead is deposited at the cathode.


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