Elements P and Q form two types of non-volatile, non-ionizable compounds PQ and $\mathrm{PQ}_2$. Whe

Question

Elements P and Q form two types of non-volatile, non-ionizable compounds PQ and $\mathrm{PQ}_2$. When 1 g of PQ is dissolved in 50 g of solvent ' $\mathrm{A}^{\prime}, \Delta \mathrm{T}_{\mathrm{b}}$ was 1.176 K while when 1 g of $\mathrm{PQ}_2$ is dissolved in 50 g of solvent ' A ', $\Delta \mathrm{T}_{\mathrm{b}}$ was $0.689 \mathrm{~K} .\left(\mathrm{K}_{\mathrm{b}}\right.$ of ' $\left.\mathrm{A}^{\prime}=5 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}\right)$. The molar masses of elements P and Q (in $\mathrm{g} \mathrm{mol}^{-1}$ ) respectively, are :

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See detailed solution for explanation.