During electrolysis, reduction occurs at the: MCQ with Answer and Explanation

During electrolysis, reduction occurs at the:
A. Salt bridge
B. Electrolyte
C. Cathode
D. Anode
Answer: Option C
Solution (By JKSSB Mock Tests)
Cathode is where reduction (gain of electrons) takes place in both electrolytic and galvanic cells. Anode is where oxidation occurs. Mnemonic: RED CAT (Reduction at Cathode), AN OX (Oxidation at Anode).

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Practice More chemistry Questions

Question #1
Which of the following pairs are isobars?
A. ¹²C and ¹⁴C
B. ³⁵Cl and ³⁷Cl
C. ⁴⁰Ar and ⁴⁰Ca
D. ¹H and ²H

Correct Answer: Option C


Explanation:
Isobars are atoms of different elements with the same mass number but different atomic numbers. ⁴⁰Ar (atomic number 18) and ⁴⁰Ca (atomic number 20) both have mass number 40. Options A and D are isotopes (same element, different mass number). Option C are isotopes of hydrogen. Isobars have different chemical properties because of different proton numbers. Example: ¹⁴C and ¹⁴N.

This question belongs to: Science chemistry
Question #2
Ethanol is used as a fuel additive. The complete combustion of ethanol yields:
A. CO and H₂
B. CO and H₂O
C. CO₂ and H₂O
D. CO₂ and H₂

Correct Answer: Option C


Explanation:
Complete combustion of ethanol: C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O + heat. In sufficient oxygen, carbon burns to CO₂, hydrogen to H₂O. Incomplete combustion (lack of O₂) produces CO and soot (C). Ethanol is a biofuel, reducing CO₂ emissions if derived from biomass. It has high octane number and is blended with petrol (gasohol). CO₂ is a greenhouse gas, but bioethanol is carbon-neutral over cycle.

This question belongs to: Science chemistry
Question #3
Washing soda is:
A. Na₂CO₃·10H₂O
B. NaHCO₃
C. CaOCl₂
D. NaOH

Correct Answer: Option A


Explanation:
Washing soda is sodium carbonate decahydrate (Na₂CO₃·10H₂O). Baking soda is NaHCO₃. Caustic soda is NaOH. Bleaching powder is CaOCl₂.

This question belongs to: Science chemistry