Q12 / 160 · AP EAMCET 2022 (05 Jul Shift 2) · Chemistry

For a reaction $\mathrm{A}(\mathrm{g})+\frac{1}{2} \mathrm{~B}(\mathrm{~g}) \rightleftharpoons \mathrm{C}(\mathrm{g})+$ heat favorable conditions for the reaction to occur in the forward direction are

  • A
    Low $\mathrm{T}$ and Low $\mathrm{P}$
  • Correct answer
    B
    Low $\mathrm{T}$ and high $\mathrm{P}$
  • C
    High $T$ and Low $P$
  • D
    High $\mathrm{T}$ and high $\mathrm{P}$

Solution

$\mathrm{A}(\mathrm{g})+\frac{1}{2} \mathrm{~B}(\mathrm{~g}) \rightleftharpoons \mathrm{C}(\mathrm{g})+$ heat exothermic reaction $\therefore \quad$ Low temperature is favourable. $\Delta \mathrm{n}=-1-\left(1+\frac{1}{2}\right)=1-\frac{3}{2}=-\frac{1}{2}$ no. of gas molecules decreases in the forward reaction. So, high pressure is favourable for forward reaction.

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

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