The values of \(K_{p_1}\) and \(K_{p_2}\) for the reactions \(X \rightleftharpoons Y+Z\) ...(i) and \(A…
\(X \rightleftharpoons Y+Z\) ...(i)
and \(A \rightleftharpoons 2 B\) ...(ii)
are in ratio of \(9: 1\). If degree of dissociation of \(X\) and \(A\) be equal, then total pressure at equilibrium (i) and (ii) are in the ratio
- $3: 1$
- $1: 9$
- $36: 1$
- $1: 1$
Solution
\(\begin{array}{lcc}
& X & \rightleftharpoons & Y & + & Z \\
\text {Initial mole } & 10 & & 0 & & 0 \\
\text {mole at equilibrium } & (1-a) & & a & & a
\end{array}\)
$\begin{aligned}
& K_{p_1}=\frac{p_Y \times p_z}{p_X} \\
& =\frac{\left[\frac{\alpha \times p_1}{1+\alpha}\right]\left[\frac{\alpha \times p_1}{1+\alpha}\right]}{\left[\frac{1-\alpha}{1+\alpha}\right] p_1} \\
& K_{P_1}=\frac{\alpha^2 p_1}{1-\alpha^2}
\end{aligned}$
From equation
\(\begin{array}{lcc}
& A & \rightleftharpoons & 2 B \\
\text {Initial mole } & 10 & & 0 \\
\text {mole at equilibrium } & (1-a) & & 2 a
\end{array}\)
$\begin{aligned}
& K_{p_2}=\frac{\left[\frac{2 \alpha}{1+\alpha} \cdot p_2\right]^2}{\left[\frac{1-\alpha}{1+\alpha}\right] p_2}=\frac{4 \alpha^2 p_2}{1-\alpha^2}
\end{aligned}$
From Eqs (i) and (ii)
$\frac{K_{P_1}}{K_{P_2}}=\frac{p_1}{4 p_2}$
$\begin{array}{ll}
\Rightarrow & \frac{9}{1}=\frac{p_1}{4 p_2} \\
\Rightarrow & \therefore \frac{p_1}{p_2}=\frac{36}{1}
\end{array}$
Asked in: NEET 2008 (Screening)