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

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry5. Thermodynamics and thermochemistry1 Mark
MCQ
For which of the following $\Delta E = \Delta H$
  • A
    ${N_2}{O_4}(g)$ $\rightleftharpoons$  $2N{O_2}(g)$
  • B
    $2S{O_2}(g) + {O_2}(g)$$\rightleftharpoons$ $2S{O_3}(g)$
  • ✓
    ${H_2}(g) + C{l_2}(g)$ $\rightleftharpoons$ $2HCl(g)$
  • D
    ${H_2}(g) + \frac{1}{2}{O_2}(g)$$\rightleftharpoons$ ${H_2}O(l)$
✓

Answer

Correct option: C.
${H_2}(g) + C{l_2}(g)$ $\rightleftharpoons$ $2HCl(g)$
(c)$\Delta n = 0$ for this reaction so, $\Delta E = \Delta H$.

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