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

During electrolysis, reduction takes place at the:
A. Electrolyte
B. Cathode
C. Salt bridge
D. Anode
Answer: Option B
Solution (By JKExamLibrary)
In an electrochemical cell, reduction (gain of electrons) always occurs at the cathode, regardless of whether the cell is electrolytic or galvanic. At the anode, oxidation (loss of electrons) occurs. Memory aid: 'RED CAT' (REDuction at CAThode), 'AN OX' (OXidation at ANode). In electrolysis, the cathode is connected to the negative terminal of the battery, attracting cations which get reduced.

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Practice More chemistry Questions

Question #1
Which of the following salts is used in the manufacture of glass?
A. Sodium carbonate
B. Sodium chloride
C. Potassium nitrate
D. Ammonium chloride

Correct Answer: Option A


Explanation:
Sodium carbonate (Na₂CO₃), also called soda ash, is a key ingredient in glass manufacturing. It lowers the melting point of silica (SiO₂) and provides sodium oxide. The glass batch consists of sand (SiO₂), soda ash (Na₂CO₃), and limestone (CaCO₃). Sodium chloride is table salt, potassium nitrate used in gunpowder, ammonium chloride in batteries/leclanche cells.

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Question #2
Which of the following is an example of green chemistry?
A. Using hydrogen peroxide for bleaching paper.
B. Using leaded gasoline.
C. Using chlorine for bleaching paper.
D. Using CFCs as refrigerants.

Correct Answer: Option A


Explanation:
Green chemistry aims to design products and processes that minimize the use and generation of hazardous substances. Using hydrogen peroxide (H2O2) for bleaching paper is an example of green chemistry because it breaks down into harmless water and oxygen, unlike chlorine which can produce toxic, persistent organochlorine byproducts.

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Question #3
The acid present in vinegar is:
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B. Acetic acid
C. Lactic acid
D. Formic acid

Correct Answer: Option B


Explanation:
Vinegar is a 4-8% solution of acetic acid (CH₃COOH) in water. Formic acid is in ant sting, citric in citrus fruits, lactic in curd. Acetic acid is used as preservative and condiment.

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