Q10 / 110 · VITEEE 2023 · Chemistry

Which reaction is not affected by change in pressure?

  • Correct answer
    A
    \(\mathrm{H}_2(\mathrm{~g})+\mathrm{I}_2(\mathrm{~g}) \rightleftharpoons 2 \mathrm{HI}(\mathrm{g})\)
  • B
    \(\mathrm{N}_2(\mathrm{~g})+3 \mathrm{H}_2(\mathrm{~g}) \rightleftharpoons 2 \mathrm{NH}_3(\mathrm{~g})\)
  • C
    \(2 \mathrm{C}(\mathrm{s})+\mathrm{O}_2(\mathrm{~g}) \rightleftharpoons 2 \mathrm{CO}(\mathrm{g})\)
  • D
    \(\mathrm{SO}_2(\mathrm{~g})+2 \mathrm{O}_2(\mathrm{~g}) \rightleftharpoons 2 \mathrm{SO}_3(\mathrm{~g})\)

Solution

A reaction in which \(\Delta \mathrm{n}_{\mathrm{g}}\) is zero is not affected by change in pressure, considering various given reactions (a) \(\Delta \mathrm{n}_{\mathrm{g}}=2-2=0\) (b) \(\Delta \mathrm{n}_{\mathrm{g}}=2-(3+1)=-2\) (c) \(\Delta \mathrm{n}_{\mathrm{g}}=2-1=+1\) [Consider only gaseous substances] (d) \(\Delta \mathrm{n}_{\mathrm{g}}=2-(2+1)=-1\) Thus, (a) is the correct option.

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

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