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During the electrolysis of hot aqueous s...

During the electrolysis of hot aqueous solution of lead bromide
(a) lead ions are discharged at cathode
(b) bromine gas is liberated at cathode
(c) lead is deposited at cathode
(d) hydrogen gas is liberated at cathode

A

lead ions are discharged at cathode

B

bromine gas is liberated at cathode

C

lead is deposited at cathode

D

hydrogen gas is liberated at cathode

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AI Generated Solution

The correct Answer is:
To solve the question regarding the electrolysis of hot aqueous solution of lead bromide (PbBr2), we need to analyze what happens at both the anode and cathode during the process. ### Step-by-Step Solution: 1. **Identify the Electrolyte**: - The electrolyte in this case is hot aqueous lead bromide (PbBr2). When dissolved in water, it dissociates into lead ions (Pb²⁺) and bromide ions (Br⁻). - **Dissociation**: PbBr2 → Pb²⁺ + 2Br⁻ 2. **Determine the Reactions at the Anode**: - The anode is the positively charged electrode where oxidation occurs. In this case, bromide ions (Br⁻) will migrate towards the anode. - At the anode, each bromide ion loses an electron (oxidation) to form bromine gas (Br2). - **Reaction at Anode**: 2Br⁻ → Br2 + 2e⁻ - Thus, bromine gas is liberated at the anode. 3. **Determine the Reactions at the Cathode**: - The cathode is the negatively charged electrode where reduction occurs. Lead ions (Pb²⁺) will migrate towards the cathode. - At the cathode, each lead ion gains two electrons (reduction) to form solid lead (Pb). - **Reaction at Cathode**: Pb²⁺ + 2e⁻ → Pb - Therefore, lead is deposited at the cathode. 4. **Analyze the Given Options**: - (a) Lead ions are discharged at cathode - **True** (Pb²⁺ ions are reduced). - (b) Bromine gas is liberated at cathode - **False** (Bromine gas is liberated at anode). - (c) Lead is deposited at cathode - **True** (Lead is deposited as a solid). - (d) Hydrogen gas is liberated at cathode - **False** (No hydrogen gas is involved in this reaction). 5. **Conclusion**: - The correct answer is (c) lead is deposited at cathode. ### Final Answer: (c) Lead is deposited at cathode. ---
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ICSE-ELECTROLYSIS-QUESTION FOR PRACTICE ON EXAMINATION PATTERN
  1. Which one will not migrate towards cathode in an electrolytic cell ?

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  2. During the electrolysis of molten lead bromide :

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  3. During the electrolysis of hot aqueous solution of lead bromide (a)...

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  4. A metal object is to be electroplated with silver . The electrolyte se...

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  5. A knife is to be electroplated with nickel . The electrolyte selected ...

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  6. An aqueous solution of ethanoic acid contains

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  7. During the electrolysis of water containing dilute sulphuric acid

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  8. An aqueous solution contains H^(+),Ag^(+),Fe^(2+) and Zn^(2+) ions . ...

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  9. On passing electricity through an acidified solution of copper (II) su...

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  10. Which one of Na, Mg , Fe , and Cu has greater tendency to form ions?

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  11. Which one of Na, Mg , Fe , and Cu has least tendency to form ions ?

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  12. The electrolyte which is completely ionised in its aqueous solution is...

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  13. The elctrolyte which is partially ionised in its aqueous solution is

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  14. During the electrolysis of acidified solution of copper sulphate , t...

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  15. Sodium chloride is a electrolyte .

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  16. In the eletroplating of an object with silver , is selected as elect...

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  17. In aqueous solution , ethanoic acid is ionised .

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  18. During electrolysis of acidfied water , oxygen gas is produced at .

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  19. In the electrolysis refining of blister copper , a thin strip of pure ...

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  20. In the presence of hydrogen ions , a zinc ion reduced .

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