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

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry5. Thermodynamics and thermochemistry1 Mark
MCQ
Assertion : $\Delta H$ and $\Delta E$ are almost same for the reaction $N_2 (g) + O_2 (g)  \rightleftharpoons  2NO(g)$
Reason : All reactants and products are gases.
  • A
    If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
  • B
    If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
  • ✓
    If the Assertion is correct but Reason is incorrect.
  • D
    If both the Assertion and Reason are incorrect.
✓

Answer

Correct option: C.
If the Assertion is correct but Reason is incorrect.
c
$\Delta H = \Delta E + (RT)^{\Delta n}$ If there is no change in the moles of reactants (gaseous) and products (gaseous) $\Delta n = 0$

$\therefore $ $\Delta H = \Delta E$

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