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

During electrolysis, reduction occurs at the:
A. Cathode
B. Anode
C. Electrolyte
D. Salt bridge
Answer: Option A
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
The calorific value of a fuel is expressed in:
A. mol/L
B. atm
C. °C
D. kJ/kg or J/g

Correct Answer: Option D


Explanation:
Calorific value is the energy released per unit mass or volume of fuel. Common units: kJ/kg, kJ/g, J/g, kcal/kg, Btu/lb. It measures fuel efficiency. Hydrogen has about 141.9 MJ/kg (higher), petrol ~47 MJ/kg. Temperature (°C) is not a unit for calorific value. Pressure and concentration are not appropriate.

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C. Smoke detectors
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Correct Answer: Option A


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Carbon-14 (half-life ~5730 years) is used to determine the age of archaeological and geological organic samples up to ~50,000 years. Cobalt-60 for cancer; Am-241 for smoke detectors.

This question belongs to: Science chemistry
Question #3
Assertion (A): Dry HCl gas does not change the color of dry litmus paper. Reason (R): Acids produce H⁺ ions only in the presence of water.
A. Both A and R are true and R is the correct explanation of A.
B. A is false but R is true.
C. A is true but R is false.
D. Both A and R are true but R is NOT the correct explanation of A.

Correct Answer: Option A


Explanation:
The acidic behavior of HCl is due to the presence of H⁺ (or H₃O⁺) ions, which are generated only when it dissolves in water. Without moisture, HCl doesn't dissociate to produce H⁺, so it doesn't change the color of dry litmus. Both statements are correct and R explains A.

This question belongs to: Science chemistry