Elevation in Boiling Point - Practice Questions & MCQ

Which of the following statements is correct for the boiling point of solvent containing a dissolved solid substance:

Pressure cooker reduces cooking time for food because:

The temperature at which vapor pressure of a liquid is equal to external pressure is known as-

The unit of Ebullioscopic Constant is

Solute ‘X’ dimerises in water to the extent of 80%. 2.5g of ‘X’ in 100g of water increases the boiling point by 0.3 0C. The molar mass of ‘X’ is [Kb=0.52K kg mol-1]

Which of the following aqueous solutions will exhibit the highest boiling point?

Arrange the following solutions in order of their increasing boiling points.
(i) $10^{-4} \mathrm{M} \mathrm{NaCl}$
(ii) $10^{-4} \mathrm{M}$ $Urea$
(iii) $10^{-3} \mathrm{M} \mathrm{NaCl}$
(iv) $10^{-2} \mathrm{M} \mathrm{NaCl}$

Assertion (A): Elevation in boiling point is a colligative property.

Reason (R): Elevation in boiling point is directly proportional to molarity.

The quantity of heat (in J) required to raise the temperature of 1.0 kg of ethanol from 293.45 K to the boiling point and then change the liquid to vapor at that temperature is closest to

[Given: Boiling point of ethanol 351.45 K specific heat capacity of liquid ethanol $2.44 \mathrm{~J} \mathrm{~g}^{-1} \mathrm{~K}^{-1}$. Latent heat of vaporization of ethanol $855 \mathrm{~J} \mathrm{~g}^{-1}$ ]