DIRECTIONS: These are Assertion-Reason type questions.Question contains two statements:Statement-1 (Assertion) and Statement-2 (Reason). Answer these question from the following four options.

Statement-1 :Camphor is used as solvent in the determination of molecular masses of naphthalene,anthraceneetc.
Statement-2 :Camphor has high molal elevation constant

Statement-1 is true, Statement-2 is true, Statement-2 is a correct explanation for Statement-1
Statement-1 is True, Statement-2 is True ; Statement-2 is NOT a correct explanation for Statement-1
Statement-1 is True,Statement-2 is False
Statement-1 is False, Statement-2 is True

Solution

Camphor has high molal depression constant.

DIRECTIONS: These are Assertion-Reason type questions.Question contains two statements:Statement-1 (Assertion) and Statement-2 (Reason). Answer these question from the following four options.

Statement-1:Azeotropic mixtures are formed only by non-ideal solutions and they may have boiling points either greater than both the components or less than both the components.
Statement-2 :The composition of the vapour phase is same as that of the liquid phase of an azeotropic mixture.

Statement-1 is true, Statement-2 is true, Statement-2 is a correct explanation for Statement-1
Statement-1 is True, Statement-2 is True ; Statement-2 is NOT a correct explanation for Statement-1
Statement-1 is True,Statement-2 is False
Statement-1 is False, Statement-2 is True

DIRECTIONS: These are Assertion-Reason type questions.Question contains two statements:Statement-1 (Assertion) and Statement-2 (Reason). Answer these question from the following four options.

Statement-1 :If a liquid solute more volatile than the solvent is added to the solvent, the vapour pressure of the solution may increase i.e.,p_s > p^o.
Statement-2 :In the presence of a more volatile liquid solute,only the solute will form the vapours and solvent will not

Statement-1 is true, Statement-2 is true, Statement-2 is a correct explanation for Statement-1
Statement-1 is True, Statement-2 is True ; Statement-2 is NOT a correct explanation for Statement-1
Statement-1 is True,Statement-2 is False
Statement-1 is False, Statement-2 is True

Solution

Both the solute and solvent will form the vapours but vapour phase will become richer in the more volatile component.

For a dilute solution containing 2.5 g of a non-volatile non-electrolyte solute in 100 g of water, the elevation in boiling point at 1 atm pressure is 2°C. Assuming concentration of solute is much lower than the concentration of solvent, the vapour pressure (mm of Hg) of the solution is(take Kb= 0.76 K kg mol–1)

Solution

The freezing point (in °C) of a solution containing 0.1 g of K₃[Fe(CN)₆] (Mol. wt. 329) in 100 g of water (K_f = 1.86 K kg mol^-1) is

–2.3 ×10^-2
–5.7 × 10^-2
–5.7 × 10^-3
–1.2 × 10^-2

Solution

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