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5. Thermodynamics and thermochemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry5. Thermodynamics and thermochemistry1 Mark
MCQ
Heat of combustion $\Delta H$ of $C{H_4},\,{C_2}{H_6},\,{C_2}{H_4}$ and ${C_2}{H_2}$ gases are $-212.8, -373.0, -337.0$ and $-310.5\, kcal $ respectively at the same temperature. The best fuel among these gases is
  • ✓
    $C{H_4}$
  • B
    ${C_2}{H_6}$
  • C
    ${C_2}{H_4}$
  • D
    ${C_2}{H_2}$
✓

Answer

Correct option: A.
$C{H_4}$
(a)$C{H_4}$ is the best fuel because its calorific value $ = \frac{{ - 212.8}}{{16}} = - 13.3\,kcal\,/\,g$ is higher among the other gases.

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