ICSE Chemistry>Chapter 2 - Solutions>NUMERICAL PROBLEMS>Q 5

MEDIUM

12th ICSE

IMPORTANT

Earn 100

A solution prepared by dissolving $0.300 g$ of an unknown compound in $30 g$ of ${CCl}_{4}$ has a boiling point that is $0.392 ° C$ higher than that of pure ${CCl}_{4}$ . What is the molecular weight of solute? (Molal boiling point elevation constant of ${CCl}_{4}$ is $5.02 ° C / m$ )

Important Questions on Solutions

MEDIUM

12th ICSE

IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>NUMERICAL PROBLEMS>Q 6

0.85 %

aqueous solution of

{NaNO}_{3}

is apparently

90 %

dissociated at

27 ° C

. Calculate its osmotic pressure.

(R = 0.0821 L atm K^{- 1} {mol}^{- 1})

.

MEDIUM

12th ICSE

IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>NUMERICAL PROBLEMS>Q 7

A

1.2 %

solution of

NaCl

is isotonic with

7.2 %

solution of glucose. Calculate the van't Hoff factor for

NaCl

.

HARD

12th ICSE

IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>NUMERICAL PROBLEMS>Q 8

2 g

of benzoic acid dissolved in

25 g

of

C_{6} H_{6}

show a depression in freezing point equal to

1.62 K

. Molal depression constant of

C_{6} H_{6}

is

4.9 K {mol}^{- 1} Kg

. What is the percentage association of acid if it forms double molecules in solution?

HARD

12th ICSE

IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>NUMERICAL PROBLEMS>Q 9

x g

of a non-electrolytic compound (molar mass

= 200

) are dissolved in

1.0 L

of

0.05 M

NaCl

aqueous solution. The osmotic pressure of this solution is found to be

4.92 atm

at

27 ° C

. Calculate the value of

x

. Assume complete dissociation of

NaCl

and ideal behaviour of the solution

(R = 0.0821 L atm K^{- 1} {mol}^{- 1})

.

MEDIUM

12th ICSE

IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>NUMERICAL PROBLEMS>Q 10

The degree of dissociation of

Ca {({NO}_{3})}_{2}

in a dilute aqueous solution containing

7.0 g

of the salt per

100 g

of water at

100 ° C

is

70

per cent. If the vapour pressure of water at

100 ° C

is

760 mm

, calculate the vapour pressure of the solution.

MEDIUM

12th ICSE

IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>NUMERICAL PROBLEMS>Q 11

Calculate the boiling point of a solution containing

0.61 g

of benzoic acid in

50 g

of carbon disulphide assuming

84 %

dimerisation of the acid. The boiling point and

k_{b}

of

{CS}_{2}

are

46.2 ° C

and

2.3 K kg {mol}^{- 1}

.

MEDIUM

12th ICSE

IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>NUMERICAL PROBLEMS>Q 12

How many grams of

KCl

should be added to

1.00 kilogram

of water to lower its freezing point to

- 8.0 ° C

?

K_{f} (H_{2} O) = 1.88 ° C kg {mol}^{- 1}

(At. masses :

K = 39, Cl = 35.5

).

MEDIUM

12th ICSE

IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>NUMERICAL PROBLEMS>Q 13

Calculate the freezing point of an aqueous solution of a non-electrolyte having an osmotic pressure of

2.0 atm

at

300 K

.