Solutions Quiz 9 – Punjab Meritorious School Preparation Portal

Welcome to your 27th Aug Solutions Quiz 9 CBT TEST

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A 0.1 molal aqueous solution of a weak acid is 30 % ionized. If Kf for water is 1.86 °C/m, the freezing point of the solution will be:

– 0.18 °C

– 0.54 °C

– 0.36 °C

– 0.24 °C

A binary liquid solution is prepared by mixing n-heptane and ethanol. Which one of the following statements is correct regarding the behaviour of the solution?

The solution is non-ideal, showing – ve deviation from Raoult’s Law

The solution is non-ideal, showing + ve deviation from Raoult’s Law.

n-heptane shows + ve deviation while ethanol shows – ve deviation from Raoult’s Law.

The solution formed is an ideal solution.

Mole fraction of the solute in a 1.00 molal aqueous solution is

0.1770

0.0177

0.0344

1.7700

The van’t Hoff factor i for a compound which undergoes dissociation in one solvent and association in other solvent is respectively:

less than one and greater than one.

less than one and less than one.

greater than one and less than one.

greater than one and greater than one.

The molarity of a solution obtained by mixing 750 mL of 0.5(M) HCl with 250 mL of 2(M) HCl will be :

0.875 M

1.00 M

1.75 M

0.975 M

A mixture of ethyl alcohol and propyl alcohol has a vapour pressure of 290 mm Hg at 300 K. The vapour pressure of propyl alcohol is 200 mm Hg. If the mole fraction of ethyl alcohol is 0.6, its vapour pressure (in mm Hg) at the same temperature will be

360

350

300

700

2.05

2.62

3.11

0.381

0.955 M and 1.910 M

1.910 M and 0.955 M

1.90 M and 1.910 M

0.477 M and 0.477 M

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