Top Equilibrium Questions from Past NEET Exams

Q 1 :
In which of the following equilibria, $K_{p}$ and $K_{c}$ are not equal? [2024]

${PCl}_{5 (g)} ⇌ {PCl}_{3 (g)} + {Cl}_{2 (g)}$
$H_{2 (g)} + I_{2 (g)} ⇌ 2 {HI}_{(g)}$
${CO}_{(g)} + H_{2} O_{(g)} ⇌ {CO}_{2 (g)} + H_{2 (g)}$
$2 {BrCl}_{(g)} ⇌ {Br}_{2 (g)} + {Cl}_{2 (g)}$

(1)

$K_{p} = K_{c} {(R T)}^{Δ n_{g}}$

When $Δ n_{g} \neq 0$ , $K_{p} \neq K_{c}$

For option (1), $Δ n_{g} = 2 - 1 = 1 \neq 0$

Thus, $K_{p} \neq K_{c}$

Q 2 :
Consider the following reaction in a sealed vessel at equilibrium with concentrations of

$N_{2} = 3.0 \times 10^{- 3}$ M, $O_{2} = 4.2 \times 10^{- 3}$ M and $N O = 2.8 \times 10^{- 3}$ M.

$2 N O_{(g)} ⇌ N_{2 (g)} + O_{2 (g)}$

If 0.1 $mol$ $L^{- 1}$ of ${NO}_{(g)}$ is taken in a closed vessel,

what will be the degree of dissociation $(α)$ of ${NO}_{(g)}$ at equilibrium? [2024]

0.00889
0.0889
0.8889
0.717

(4)

$\begin{matrix} 2 {NO}_{(g)} & ⇌ & N_{2 (g)} & + \begin{matrix} O_{2 (g)} \end{matrix} \\ 0.1 & 0 & 0 \\ 0.1 - x & \frac{x}{2} & \frac{x}{2} \end{matrix}$

$K_{c} = \frac{\frac{x}{2} \times \frac{x}{2}}{{(0.1 - x)}^{2}}$

$Again, K_{c} = \frac{[N_{2}] [O_{2}]}{[NO]^{2}} = \frac{3 \times 10^{- 3} \times 4.2 \times 10^{- 3}}{{(2.8 \times 10^{- 3})}^{2}} = 1.607$

$\Rightarrow \frac{x^{2}}{4 {(0.1 - x)}^{2}} = 1.607 \Rightarrow \frac{x}{2 (0.1 - x)} = \sqrt{1.607}$

$\Rightarrow \frac{x}{0.2 - 2 x} = 1.26 \Rightarrow x = 0.252 - 2.52 x$

$\Rightarrow 3.52 x = 0.252 \Rightarrow x = \frac{0.252}{3.52} = 0.0716$

$Degree of dissociation, α = \frac{0.0716}{0.1} = 0.716$

Topic Question Set

Q 1 :
In which of the following equilibria, $K_{p}$ and $K_{c}$ are not equal? [2024]

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Topic Question Set

Q 1 : In which of the following equilibria, Kp and Kc are not equal? [2024]

Q 2 : Consider the following reaction in a sealed vessel at equilibrium with concentrations of N2=3.0×10-3M, O2=4.2×10-3M and NO=2.8×10-3M. 2NO(g)⇌N2(g)+O2(g) If 0.1 mol L-1 of NO(g) is taken in a closed vessel, what will be the degree of dissociation (α) of NO(g) at equilibrium? [2024]

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Q 1 :
In which of the following equilibria, $K_{p}$ and $K_{c}$ are not equal? [2024]