Q8 / 120 · VITEEE 2018 · Chemistry

For which one of the following systems at equilibrium, at constant temperature will the doubling of the volume cause a shift to the right?

  • A
    $\mathrm{H}_{2}(\mathrm{~g})+\mathrm{Cl}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{HCl}(\mathrm{g})$
  • B
    $2 \mathrm{CO}(\mathrm{g})+\mathrm{O}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{CO}_{2}(\mathrm{~g})$
  • C
    $\mathrm{N}_{2}(\mathrm{~g})+3 \mathrm{H}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{NH}_{3}(\mathrm{~g})$
  • Correct answer
    D
    $\mathrm{PCl}_{5}(\mathrm{~g}) \rightleftharpoons \mathrm{PCl}_{3}(\mathrm{~g})+\mathrm{Cl}_{2}(\mathrm{~g})$

Solution

When volume is increased the conc. decreases \& the equilibrium shifts in the direction where more moles are formed.

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

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