Q12 / 160 · AP EAMCET 2022 (06 Jul Shift 1) · Chemistry

For ammonia formation from constituent elements, the expression for $\mathrm{K}_{\mathrm{C}}$ is

  • A
    $\mathrm{K}_{\mathrm{C}}=\frac{\left[\mathrm{NH}_3\right]^3}{\left[\mathrm{~N}_2\right]^3\left[\mathrm{H}_2\right]^3}$
  • Correct answer
    B
    $\mathrm{K}_{\mathrm{C}}=\frac{\left[\mathrm{NH}_3\right]^2}{\left[\mathrm{~N}_2\right]\left[\mathrm{H}_2\right]^3}$
  • C
    $\mathrm{K}_{\mathrm{C}}=\frac{\left[\mathrm{NH}_3\right]}{\left[\mathrm{N}_2\right]\left[\mathrm{H}_2\right]}$
  • D
    $\mathrm{K}_{\mathrm{C}}=\left[\mathrm{NH}_3\right]^2$

Solution

$\mathrm{N}_2+3 \mathrm{H}_2 \rightarrow 2 \mathrm{NH}_3 ; \mathrm{K}_{\mathrm{c}}=\frac{\left[\mathrm{NH}_3\right]^2}{\left[\mathrm{~N}_2\right]\left[\mathrm{H}_2\right]^3}$

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

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