Consider separate solutions of 0 . 500 M C 2 H 5 OH aq , 0 . 100 M Mg 3 PO 4 2 aq , 0 . 250 M KBr aq and 0 . 125 M Na 3 PO 4 aq at 25 ° C . Which statement is true about these solutions, assuming all salts to be strong electrolytes?

They all have the same osmotic pressure.

0 . 100 M Mg 3 ( PO 4 ) 2 aq has the highest osmotic pressure.

0 . 125 M Na 3 PO 4 aq has the highest osmotic pressure.

0 . 500 M C 2 H 5 OH aq has the highest osmotic pressure.

HARD

Earn 100

The vapour density of ${PCl}_{5}$ is $104.25$ but when heated to $230 ° C$ , its vapour density is reduced to $62$ . The degree of dissociation of ${PCl}_{5}$ at this temperature will be:-

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Important Questions on Solutions

EASY

Chemistry>Physical Chemistry>Solutions>Van't Hoff's Factor

The van't Hoff factor

(i)

for a dilute aqueous solution of the strong electrolyte barium hydroxide is

EASY

Chemistry>Physical Chemistry>Solutions>Van't Hoff's Factor

Consider the following equilibrium for benzoic acid in benzene

$2 C_{6} H_{5} COOH ⇌ {(C_{6} H_{5} COOH)}_{2}$

If $x$ represents the degree of association of the solute then relationship between total number of moles of particles at equilibrium and van't Hoff factor $(i)$ is

EASY

Chemistry>Physical Chemistry>Solutions>Van't Hoff's Factor

A one molal solution of sodium chloride in water has the same boiling point as

EASY

Chemistry>Physical Chemistry>Solutions>Van't Hoff's Factor

Vant Hoff factors of equimolal solutions of sodium chloride, barium chloride and glucose in water are

MEDIUM

Chemistry>Physical Chemistry>Solutions>Van't Hoff's Factor

Determination of the molar mass of acetic acid in benzene using freezing point depression is affected by:

EASY

Chemistry>Physical Chemistry>Solutions>Van't Hoff's Factor

Which of the following compounds have the same value of vant Hoff's factor

(i)

as that of

{Al}_{2} {({SO}_{4})}_{3}

EASY

Chemistry>Physical Chemistry>Solutions>Van't Hoff's Factor

Which of the following aqueous solutions should have the highest boiling point?

MEDIUM

Chemistry>Physical Chemistry>Solutions>Van't Hoff's Factor

The freezing point of

0.1

molal solution of

{CH}_{3} COOH

in benzene is

0.256 K

(K_{f} = 5.12 K m^{- 1})

. What conclusion will you draw about the molecular state of

{CH}_{3} COOH

C_{6} H_{6}

EASY

Chemistry>Physical Chemistry>Solutions>Van't Hoff's Factor

An aqueous solution of a salt

M X_{2}

at certain temperature has a Van't Hoff factor of

2

. What is the degree of dissociation for this solution of the salt?

EASY

Chemistry>Physical Chemistry>Solutions>Van't Hoff's Factor

Relationship between van’t Hoff’s factor (i) and degree of dissociation

(α)

EASY

Chemistry>Physical Chemistry>Solutions>Van't Hoff's Factor

An aqueous solution of which of the following compounds causes more freezing point depression?

HARD

Chemistry>Physical Chemistry>Solutions>Van't Hoff's Factor

Consider the galvanic cell.

P t_{(S)} | H_{2} (1 bar) | H^{+}_{(a q)} 1 M | | H C l_{(a q)} 1 M | C l_{2} (1 bar) | P t_{(s)}

. After running the cell for sometime, the concentration of the electrolyte is automatically raised to

3 M H C l

. Molar conductivity of the

3 M H C l

is about

240 S c m^{2} m o l^{- 1}

and limiting molar conductivity of

H C l

is about

420 S c m^{2} m o l^{- 1}

. If

K_{b}

of water is

0.52 K k g m o l^{- 1}

, calculate the boiling point of the electrolyte at the end of the experiment

MEDIUM

Chemistry>Physical Chemistry>Solutions>Van't Hoff's Factor

In a solvent

50 %

of an acid HA dimerizes and the rest dissociates. The van't Hoff factor of the acid is _____

\times 10^{- 2}

(Round off to the nearest integer)

MEDIUM

Chemistry>Physical Chemistry>Solutions>Van't Hoff's Factor

Which one of the following electrolytes has the same value of van's Hoff's factor (i) as that of

A l_{2} {(S O_{4})}_{3}

(if all are

100 %

ionized)?

MEDIUM

Chemistry>Physical Chemistry>Solutions>Van't Hoff's Factor

Which one of the following

0.06 M

aqueous solutions has lowest freezing point ?

MEDIUM

Chemistry>Physical Chemistry>Solutions>Van't Hoff's Factor

When $0.4 g$ of acetic acid is dissolved in $40 g$ of benzene, the freezing point of the solution is lowered by $0.45 K$ . Calculate the degree of association of acetic acid. Acetic acid forms dimer when dissolved in benzene. ( $K_{f}$ for benzene $= 5.12 K kg {mol}^{- 1}$ , atomic mass: $C = 12, H = 1, O = 16$ ).

EASY

Chemistry>Physical Chemistry>Solutions>Van't Hoff's Factor

Define the following term :

Van't Hoff factor

EASY

Chemistry>Physical Chemistry>Solutions>Van't Hoff's Factor

The van’t Hoff factor

i

for a compound which undergoes dissociation in one solvent and association in another solvent is respectively

HARD

Chemistry>Physical Chemistry>Solutions>Van't Hoff's Factor

Consider separate solutions of

0.500 M C_{2} H_{5} OH (aq), 0.100 M {Mg}_{3} {({PO}_{4})}_{2} (aq), 0.250 M KBr (aq)

and

0.125 M {Na}_{3} {PO}_{4} (aq)

25 ° C

. Which statement is true about these solutions, assuming all salts to be strong electrolytes?

EASY

Chemistry>Physical Chemistry>Solutions>Van't Hoff's Factor

For which among the following equimolar aqueous solutions Van't Hoff factor has the lowest value?

The vapour density of PCl5 is 104.25 but when heated to 230°C, its vapour density is reduced to 62. The degree of dissociation of PCl5 at this temperature will be:-

Important Questions on Solutions

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The vapour density of ${PCl}_{5}$ is $104.25$ but when heated to $230 ° C$ , its vapour density is reduced to $62$ . The degree of dissociation of ${PCl}_{5}$ at this temperature will be:-