MPSC Rajyaseva 2023 GS Paper 1 — Question 64

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खालीलपैकी कोणत्या हायड्रोकार्बनमध्ये 80% कार्बन असतो ? (H = 1, C = 12) Which of the following hydrocarbon has 80% carbon ? (H = 1, C = 12)

a)बेंझीन / Benzene

b)मीथेन / Methane

c)इथेन / Ethane✓ Correct

d)सायक्लोहेक्झेन / Cyclohexane

Percentage composition by mass = (mass of carbon / molar mass) x 100. Ethane (C2H6): molar mass = 2(12) + 6(1) = 30. %C = 24/30 x 100 = 80%. For comparison: Methane (CH4) is 75% C, Benzene (C6H6) is 92.3% C, Cyclohexane (C6H12) is 85.7% C -- only Ethane matches the given 80%.

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