Q44 / 180 · COMEDK 2020 · Chemistry

Considering the reaction, $\mathrm{C}(s)+\mathrm{O}_{2}(g) \longrightarrow \mathrm{CO}_{2}(g)+393.5 \mathrm{~kJ}$ The signs of $\Delta H, \Delta \mathrm{S}$ and $\Delta G$ respectively are $\begin{array}{ll}\text { a. }-,+,- & \text { b. }-,-,- \\ \text { c. }-,+,+ & \text { d. }+,-,-\end{array}$

  • Correct answer
    A
    $-,+,-$
  • B
    $-,-,-$
  • C
    $-,+,+$
  • D
    $+,-,-$

Solution

The reaction $\left.\mathrm{Q}^{\prime} s\right)+\mathrm{O}_{2}(g) \longrightarrow \mathrm{CO}_{2}(g)+3935 \mathrm{~kJ}$ is a combustion reaction. For combustion reaction. $\Delta H$ and $\Delta G$ are negative but $\Delta S$ is positive.

Hence, the correct answer is option: 'A'.

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