Pure water freezes at 273K and 1bar and boils at 373K and 1 bar. Addition of non-volatile solute changes the freezing and boiling point of water. Boiling point of an aqueous solution is 100.560C. Latent heat of fusion and latent heat of vaporization of water are 80 Cal.g −1 and 540 Cal.g−1 respectively. The figures shown below represent plot ofvapour pressure (V.P) versus temperature (T). Identify the correct plot.

ΔTbΔTf=Tb2×LfTf2×Lv⇒0.56ΔTf=373×373×80273×273×540⇒ΔTf=2

Pure water freezes at 273K and 1bar and boils at 373K and 1 bar. Addition of non-volatile solute changes the freezing and boiling point of water. Boiling point of an aqueous solution is 100.560C. Latent heat of fusion and latent heat of vaporization of water are 80 Cal.g −1 and 540 Cal.g−1 respectively. The figures shown below represent plot ofvapour pressure (V.P) versus temperature (T). Identify the correct plot.

ΔTbΔTf=Tb2×LfTf2×Lv⇒0.56ΔTf=373×373×80273×273×540⇒ΔTf=2

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Pure water freezes at 273K and 1bar and boils at 373K and 1 bar. Addition of non-volatile solute changes the freezing and boiling point of water. Boiling point of an aqueous solution is 100.56⁰C. Latent heat of fusion and latent heat of vaporization of water are ${80 Cal.g}^{- 1} and 540 Cal . g^{- 1}$ respectively. The figures shown below represent plot of
vapour pressure (V.P) versus temperature (T). Identify the correct plot.

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Detailed Solution

$\frac{Δ T_{b}}{Δ T_{f}} = \frac{T_{b}^{2} \times L_{f}}{T_{f}^{2} \times L_{v}} \Rightarrow \frac{0.56}{Δ T_{f}} = \frac{373 \times 373 \times 80}{273 \times 273 \times 540} \Rightarrow Δ T_{f} = 2$

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