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NEET UG CHEMISTRY MCQ: THERMODYNAMICS

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Application +4 | -1
Heat of combustion of CH4,C2H4,C2H6\mathrm{C}{\mathrm{H}_4},{\mathrm{C}_2}{\mathrm{H}_4},{\mathrm{C}_2}{\mathrm{H}_6} are - 890,-1411 and -1560 kJ/mol respectively. Which has the lowest calorific fuel value in kJ/g?
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Correct option: B
C2H4{\mathrm{C}_2}{\mathrm{H}_4}
Option B (C2H4{\mathrm{C}_2}{\mathrm{H}_4}) is correct because it has the lowest calorific value when the heat of combustion is divided by its molar mass.

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