$\Delta n = - 1$ for reaction $2S{O_2} + {O_2}$ $ \rightleftharpoons $ $2S{O_3}$
So for this reaction ${K_p}$ is less than ${K_c}$.
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Which of the following is/are true about $\mathrm{A}^{\prime}, \mathrm{B}^{\prime}, \mathrm{C}^{\prime}$ and $\mathrm{D}^{\prime}$ ?
$A$. Order of atomic radii: $\mathrm{B}^{\prime}<\mathrm{A}^{\prime}<\mathrm{D}^{\prime}<\mathrm{C}^{\prime}$
$B$. Order of metallic character: $\mathrm{B}^{\prime}<\mathrm{A}^{\prime}<\mathrm{D}^{\prime}<\mathrm{C}^{\prime}$
$C$. Size of the element : $\mathrm{D}^{\prime}<\mathrm{C}^{\prime}<\mathrm{B}^{\prime}<\mathrm{A}^{\prime}$
$D$. Order of ionic radii : $\mathrm{B}^{\prime+}<\mathrm{A}^{\prime+}<\mathrm{D}^{\prime+}<\mathrm{C}^{\prime+}$
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