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Standard X

Chemistry

Electrolysis and Electrolytes

When fused le...

Question

When fused lead bromide is electrolysed, we observe______.

a silver grey deposit at anode and a reddish brown deposit at cathode

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a silver grey deposit at cathode and a reddish brown deposit at anode

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a silver grey deposit at cathode and reddish brown fumes at anode

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a silver grey fumes at anode and reddish brown fumes at cathode

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Solution

The correct option is D a silver grey deposit at cathode and reddish brown fumes at anode
During the electrolysis of lead bromide, Graphite being an inert electrode is used as both anode and cathode. Lead bromide dissociates to form $P b^{2 +}$ ions are discharged at the cathode as neutral lead atoms by accepting electrons whereas ${B r}^{-}$ ions are discharged at the anode as neutral bromine atoms by giving up electrons.

Hence, a silver-grey deposit of lead is obtained at the cathode and reddish-brown fumes of bromine are obtained at the anode.

Therefore, option C is correct.

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Similar questions

(a) The observation seen when fused lead bromide is electrolysed is :

(i) A silver grey deposit at an anode and a reddish brown deposit at the cathode.

(ii) A silver grey deposit at the cathode and a reddish brown deposit at the anode.

(iii) A silver grey deposit at the cathode and reddish brown fumes at the anode.

(iv) Silver grey fumes at anode reddish brown fumes at the cathode.

(b) During electroplating an article with silver, the electrolyte used is :

(i) Silver nitrate solution

(ii) Silver cyanide solution

(iii) Sodium argentocyanide solution

(iv) Nickel sulphate solution.

(d) State your observation: At the cathode when acidified aqueous copper sulphate solution is electrolysed with copper electrodes.

(e) State which electrode: anode or cathode is the oxidising electrode. Give a reason for the same.

(f) Name the king of particle present in :

(i) Sodium hydroxide soln.

(ii) Carbonic acid

(iii) Sugar soln.

(g) $M_{2} O$ is the oxide of a metal 'M' which is above hydrogen in the activity series. $M_{2} O$ when dissolved in water forms the corresponding hydroxide which is a good conductor of electricity.

(i) State the reaction taking place at the cathode

(ii) Name the product at the anode.

Q. How many grams of silver would be deposited at cathode if

0.05 d m^{3}

of oxygen measured at NTP is liberated at the anode when silver nitrate solution is electrolysed between platinum electrodes?
(Given: Atomic mass of

A g = 108, O = 16

)

Q. During electroplating, copper is deposited at the __________ (anode/cathode).

Q. Choose the correct answer:
During the electrolysis of molten lead bromide, which of the following takes place?
(a) Bromine is released at the cathode
(b) Lead is deposited at the anode
(c) Bromine ions gain electrons
(d) Lead is deposited at the cathode

Q. How many kgs of silver would be deposited at cathode if

0.0342 d m^{3}

of oxygen measured at NTP is liberated at the anode when silver nitrate solution is electrolyzed between platinum electrodes?(Given : Atomic masses of Ag = 108, O =16)

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