NEET Chemistry MCQs

A 0.1 molal aqueous solution of a weak electrolyte, HX, freezes at -0.208 °C. Assuming ideal behavior, what is the van't Hoff factor (i) for HX in this solution? (K$_f$ for water = 1.86 K kg mol$^{-1}$)

The observed freezing point depression of a 0.01 m aqueous solution of a weak acid HA is 0.0205 °C. If the $K_f$ of water is 1.86 K kg/mol, which expression correctly calculates the percent ionization of the weak acid?

A solution containing 1 g of a non-volatile solute in 100 g of camphor lowers the freezing point of camphor by 0.4 °C. If the molal depression constant ($K_f$) for camphor is 40 K kg/mol, what is the molar mass of the solute?

Which colligative property is responsible for the anti-freeze action of ethylene glycol in car radiators?

The freezing point depression constant $K_f$ of cyclohexane is $20.0 \, K \, kg \, mol^{-1}$. A solution of a non-electrolyte solute in cyclohexane has a molarity of $0.050 \, m$. What is the freezing point depression for this solution (rounded off to two decimal places)?

The freezing point of camphor is 178.4°C. Its freezing point depression constant ($K_f$) is $40.0 \, K \, kg \, mol^{-1}$. A solution is prepared by dissolving 0.100 moles of a non-electrolyte solute in 250 g of camphor. What is the freezing point of the solution?

The freezing point of pure water is 0°C. A solution containing 1.0 mol of a non-volatile, non-electrolyte solute in 1.0 kg of water freezes at -1.86°C. What is the freezing point depression constant ($K_f$) for water?

A dilute aqueous solution of a certain electrolyte shows a freezing point depression three times greater than that of a non-electrolyte solution of the same molality. Assuming complete dissociation, how many ions are formed when one formula unit of the electrolyte dissolves?

If the molality of a dilute solution is doubled, what effect will this have on the molal freezing point depression constant ($K_f$)?

Which of the following colligative properties is affected by changing the molality of the solution, while its associated constant remains unchanged?