Dr. H.C. Srivastava and SUMEDHA SRIVASTAVA Solutions for Chapter: Solutions, Exercise 5: OBJECTIVE (MULTIPLE CHOICE) TYPE QUESTONS

Consider the following liquid-vapour equilibrium:

 $\mathrm{Liquid}\rightleftharpoons \mathrm{Vapour}$ 

Which of the following relation is correct?

Which of the following statements about the composition of the vapour over an ideal $1 : 1$ molar mixture of benzene and toluene is correct? Assume that the temperature is constant at $25°\mathrm{C}$. (Given, vapour pressure data at $25°\mathrm{C}$, benzene $=12.8 \mathrm{kPa},$ toluene$=3.85 \mathrm{kPa}$)

At $100°\mathrm{C}$ the vapour pressure of a solution of $6.5 \mathrm{g}$ of a solute in $100 \mathrm{g}$ water is $732 \mathrm{mm}$. If ${\mathrm{k}}_{\mathrm{b}}=0.52$, the boiling point of this solution will be

If molality of the dilute solution is doubled, the value of molal depression constant $\left({\mathrm{k}}_{\mathrm{f}}\right)$ will be 

Which of the following is dependent on temperature?

The freezing point of benzene decreases by $0.45°\mathrm{C}$ when $0.2 \mathrm{g}$ of acetic acid is added to $20 \mathrm{g}$ of benzene. If acetic acid associated to form a dimer in benzene, percentage association of acetic acid in benzene will be (${\mathrm{k}}_{\mathrm{f}}$ for benzene$=5.12 \mathrm{K} \mathrm{kg} {\mathrm{mol}}^{-1}$)

For $1$ molal aqueous solution of the following compounds, which one will show the highest freezing point?

The recommended concentration of fluoride ion in drinking water is up to $1 \mathrm{ppm}$ as fluoride ion is required to make teeth enamel harder converting $\left[3{\mathrm{Ca}}_3{\left({\mathrm{PO}}_4\right)}_2. \mathrm{Ca}{\left(\mathrm{OH}\right)}_2\right]$ to