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Multiple Choice Questions

351.

31 g of ethylene glycol (C₂H₆O₂) is mixed with 500 g of solvent (K_f of the solvent is 2 K kg mol^-1 ). What is the freezing point of the solution (in K)? (Freezing point of solvent = 273 K)

352.

Which one of the following binary liquid mixture exhibit positive deviation from Raoult's law?

Carbon disulphide-acetone
Chloroform-acetone
Bromobenzene-chlorobenzene
Benzene-toluene

353.

An aqueous solution containing 3 g of a solute of molar mass 111.6 g mol^-1 in a certain mass of water freezes at -0.125°C. The mass of water in grams present in the solution is (K_f =1.86 K kg mol^-1)

354.
In neutral or faintly alkaline medium, thiosulphate is quantitatively oxidized by KMnO₄ to

SO $_{3}^{2 -}$

SO $_{4}^{2 -}$

SO₂

SO $_{5}^{2 -}$

SO $_{4}^{2 -}$

In neutral or alkaline medium, thiosulphate is quantitavely oxidized by KMnO₄ to SO $_{4}^{2 -}$ .

8MnO $_{4}^{-}$ + 3S₂O $_{3}^{2 -}$ + H₂O → 8MnO₂ + 6HSO $_{4}^{2 -}$ + 2OH^-

355.

If the elevation in boiling point of a solution of non-volatile, non-electrolytic and non-associating solute in a solvent (K_b = x K kg mol^-1) is y K, then the depression in freezing point of solution of same concentration would be (K_f of the solvent = z K kg mol^-1)

$\frac{2 x z}{y}$
$\frac{y z}{x}$
$\frac{x z}{y}$
$\frac{y z}{2 x}$

356.

The vapour pressure of pure benzene and toluene at a particular temperature are 100 mm and 50 mm respectively. Then the mole fraction of benzene in vapour phase in contact with equimolar solution of benzene and toluene is

0.67
0.75
0.33
0.50

357.

The relation between solubility of a gas in liquid at constant temperature and external pressure is stated by which law?

Raoult's law
van't Hoff- Boyle's law
van't Hoff- Charles' law
Henry's law

358.

Identify the compound amongst the following of which 0.1 M aqueous solution has highest boiling point.

Glucose
Sodium chloride
Calcium chloride
Ferric chloride

359.

Freezing point of an aqueous solution is -0.186°C. If the values of K_b and K_f of water are respectively 0.52 K kg mol^-1 and 1.86 K kg mol^-1 then the elevation of boiling point of the solution in K is