Caustic soda is produced along with chlorine and hydrogen by electrolysis of: MCQ with Answer and Explanation

Question
Caustic soda is produced along with chlorine and hydrogen by electrolysis of:
A. HCl
B. Brine (concentrated NaCl solution)
C. NaOH solution
D. Molten NaCl
Answer: Option B
Solution (By JKExamLibrary)
Chlor-alkali process: electrolysis of brine gives NaOH (at cathode), Cl₂ (at anode), and H₂ (at cathode). Molten NaCl gives Na and Cl₂, not NaOH.
This question belongs to: Science chemistry
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Question #1
The monomer of polyvinyl chloride (PVC) is:
A. Ethene
B. Tetrafluoroethene
C. Styrene
D. Vinyl chloride
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Correct Answer: Option D

Explanation:
PVC is made by addition polymerization of vinyl chloride (CH₂=CHCl). Ethene gives polythene, styrene gives polystyrene, tetrafluoroethene gives Teflon.
This question belongs to: Science chemistry
Question #2
Vulcanization of rubber uses:
A. Sulfur
B. Oxygen
C. Carbon
D. Nitrogen
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Correct Answer: Option A

Explanation:
Sulfur forms cross-links between polyisoprene chains, converting sticky raw rubber into strong, elastic material. Process discovered by Goodyear.
This question belongs to: Science chemistry
Question #3
In an electrolytic cell, the cathode is the electrode where:
A. Electrons enter the external circuit
B. Reduction occurs
C. Anions are discharged
D. Oxidation occurs
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Correct Answer: Option B

Explanation:
Cathode is where reduction takes place (gain of electrons). In electrolytic cells, cathode is negative (connected to negative terminal of battery). Cations migrate to cathode and are reduced.
This question belongs to: Science chemistry
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