Dr. H.C. Srivastava and SUMEDHA SRIVASTAVA Solutions for Chapter: Solutions, Exercise 4: ESSAY (LONG ANSWER) TYPE QUESTIONS

Define molal depression constant and mention its units. How is it related to molar enthalpy of fusion of the solvent?

An aqueous solution of urea boils above $100°\mathrm{C}$ but freezes below $0°\mathrm{C}.$ Explain?

$\mathrm{NaCl}$ is soluble in water but insoluble in benzene. Explain?

In cold countries, ethylene glycol is added to water used in car radiators. Explain?

Salt is added to water used for boiling eggs. Explain?

What do you understand by osmosis and osmotic pressure? How is the osmotic pressure of a solution measured? What is reverse osmosis?

An aqueous solution containing  $1.70 \mathrm{g}$ of cane sugar in $100 \mathrm{mL}$ water begins to freeze at $-0.093°\mathrm{C}$. The cryoscopic constant (molal depression constant) of water is $1.86 \mathrm{K} \mathrm{kg} {\mathrm{mol}}^{-1}$. Calculate the molecular weight of cane sugar.

A decimolar solution of sodium chloride exerts an osmotic pressure of $4.82$ atmosphere at $27°\mathrm{C}$. Calculate the degree of dissociation of sodium chloride.