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

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry5. Thermodynamics and thermochemistry1 Mark
MCQ
For the reaction, $2Cl(g) \to Cl_2(g)$, the signs of $\Delta H$ and $\Delta S$ respectively, are:
  • A
    $+, -$
  • B
    $+, +$
  • ✓
    $-, -$
  • D
    $-, +$
✓

Answer

Correct option: C.
$-, -$
c
$2Cl(g) \to Cl_2(g)$ Entropy is decreasing $(-ve)$ in the reaction. Further the reaction is exothermic since a bond is being formed, i.e., $\Delta H$ is also $-ve$.

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