Test Preparation on Solution-III-Chemistry Test Series For NEET-2020

At 100⁰C the vapour pressure of a solution of 6.5g of a solute
in 100 g water is 732 mm. If Kb = 0.52, the boiling point of
this solution will be

(a) 101⁰C (b) 100⁰C
(c) 102⁰C (d) 103⁰C

Ethylene glycol is used as an antifreeze in a cold climate. Mass
of ethylene glycol which should be added to 4 kg of water to
prevent it form freezing at - 6^oC will be : ( K _f for water
=1.86K kgmol-1, and molar mass of ethylene glycol
= 62g mol^-1 )

K _f for water is 1.86 . K kgmol^-1 If your automobile radiator
holds 1.0kg of water, how may grams of ethylene glycol
(C₂H₆O₂ ) must you add to get the freezing point of the
solution lowered to - 2.8^oC

The measured freezing point depression for a 0.1m aqueous
CH₃COOH solution is 0.19ºC . The acid dissociation constant
Ka at this concentration will be (Given , Kf the molal cryoscopic
constant = 1.86K Kg mol-1)

(a) 4.76×10^-5    (b) 4×10^-5
(c) 8×10-5         (d) 2×10^-5