MCQ
In which of the following equilibrium $K_c$ and $K_p$ are not equal?
  • A
    $2NO_{(g)} \rightleftharpoons  N_{2(g)} + O_{2(g)}$
  • B
    $SO_{2(g)} + NO_{2(g)} \rightleftharpoons SO_{3(g)} + NO_{(g)}$
  • C
    $H_{2(g)} + I_{2(g)} \rightleftharpoons  2HI_{(g)}$
  • $2C_{(s)}+ O_{2(g)} \rightleftharpoons  2CO_{2(g)}$

Answer

Correct option: D.
$2C_{(s)}+ O_{2(g)} \rightleftharpoons  2CO_{2(g)}$
d
Key ldea The reaction for which the number of moles of gaseous products $\left(n_{p}\right)$ is not equal to the number of moles of gaseous reactants $\left(n_{R}\right),$ has different value of $K_{C}$ and $K_{P}$ From the equation, $K_{P}=K_{C} \times(R T)^{\Delta n_{g}}$

where, $\left[\Delta n_{g} g a s e o u s=n_{P}-n_{R}\right]$

$(a) n_{P}=n_{R}=2$ thus, $K_{P}=K_{C}$

(b) $n_{P}=n_{R}=2$ thus, $K_{P}=K_{C}$

$(c) n_{P}=n_{R}=2$ thus, $K_{P}=K_{C}$

$(d) n_{P}=2, n_{R}=1$ thus, $K_{P} \neq K_{C}$

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