Which of the following metals is extracted by electrolytic reduction? MCQ with Answer and Explanation

Which of the following metals is extracted by electrolytic reduction?
A. Zinc
B. Iron
C. Sodium
D. Copper
Answer: Option C
Solution (By JKSSB Mock Tests)
Highly reactive metals like sodium, potassium, calcium, and aluminum cannot be reduced by chemical reducing agents like carbon. They are extracted by the electrolysis of their molten chlorides or oxides. For example, sodium is extracted by the electrolysis of molten NaCl in the Down's cell.

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Practice More chemistry Questions

Question #1
Washing soda (Na₂CO₃·10H₂O) is obtained from sodium carbonate by:
A. Adding acid
B. Crystallisation from its aqueous solution
C. Heating
D. Electrolysis

Correct Answer: Option B


Explanation:
Sodium carbonate decahydrate (washing soda) is prepared by dissolving soda ash (anhydrous Na₂CO₃) in water and allowing it to crystallise. Heating would remove water of crystallization (efflorescence). Adding acid would decompose it. Electrolysis would produce NaOH and Cl₂ from brine, not washing soda directly.

This question belongs to: Science chemistry
Question #2
Which of the following sequences correctly represents the increasing order of forces of attraction between particles?
A. Water, sugar, oxygen
B. Oxygen, sugar, water
C. Sugar, water, oxygen
D. Oxygen, water, sugar

Correct Answer: Option D


Explanation:
The forces of attraction are minimum in gases, intermediate in liquids, and maximum in solids. Oxygen is a gas, water is a liquid, and sugar is a solid. Thus, the increasing order of intermolecular forces is oxygen < water < sugar, reflecting their respective physical states at room temperature.

This question belongs to: Science chemistry
Question #3
CFCs destroy ozone. Which atom is responsible?
A. Fluorine
B. Chlorine
C. Carbon
D. Oxygen

Correct Answer: Option B


Explanation:
UV radiation releases chlorine atoms from CFCs; Cl catalytically decomposes O₃: Cl + O₃ → ClO + O₂; ClO + O → Cl + O₂. One Cl atom can destroy thousands of ozone molecules.

This question belongs to: Science chemistry