In the plot of molar conductivity ( ∧ m ) vs square root of concentration ( c 1 / 2 ) , following curves are obtained for two electrolytes A and B : Answer the following : What happens on extrapolation of ∧ m to concentration approaching zero for electrolytes A and B ?

On extrapolation, for electrolyte, A limiting value of conductance is obtained that is conductance at zero concentration or infinite dilution. However, the conductance of a weak electrolyte never approaches a limiting value. Or in other words, it is not possible to find conductance at infinite dilution (zero concentration).

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.

The number of free electrons increases with increase in temperature.

There are no free electrons at any temperature

The number of free electrons is more than in a conductor.

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Important Questions on Solutions

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

In the plot of molar conductivity $(\land_{m})$ vs square root of concentration $(c^{1 / 2})$ , following curves are obtained for two electrolytes A and B :

Question Image

Answer the following :
Predict the nature of electrolytes A and B.

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

Which of the following electrolytic solution has the least specific conductance

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

Give reason: Conductivity of

{CH}_{3} COOH

decreases on dilution.

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

In the plot of molar conductivity $(\land_{m})$ vs square root of concentration $(c^{1 / 2})$ , following curves are obtained for two electrolytes A and B :

Question Image

Answer the following :

What happens on extrapolation of $\land_{m}$ to concentration approaching zero for electrolytes A and B ?

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?

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

The resistance of a conductivity cell containing

0.01 MKCl

solution at

298 K

1750 Ω

. If the conductivity of

0.01 MKCl

solution at

298 K

0.152 \times 10^{- 3} S {cm}^{- 1}

, then the cell constant of the conductivity cell is____

\times 10^{- 3} {cm}^{- 1}

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

KCl

solution of conductivity

0.14 S m^{- 1}

shows a resistance of

4.19 Ω

in a conductivity cell. If the same cell is filled with an

HCl

solution, the resistance drops to

1.03 Ω

. The conductivity of the HCl solution is ____

\times 10^{- 2} S m^{- 1}

. (Round off to the Nearest Integer).

EASY

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

Consider the statements

S 1

and

S 2

S 1

: Conductivity always increases with decreases in the concentration of electrolyte.

S 2

: Molar conductivity always increases with decreases in the concentration of electrolyte.
The correct option among the following

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

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

The molar conductivity of a

0.5 mol {dm}^{- 3}

solution of

A g N O_{3}

with electrolytic conductivity of

5.76 \times 10^{- 3} S c m^{- 1}

298 K

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

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?

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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:

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

There are two metallic spheres of same radii but one is solid and the other is hollow, then

EASY

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

In the depletion region of a diode

EASY

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

Which is the material used in making the core of a moving coil galvanometer?

EASY

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

What is the semiconductor

?

EASY

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

All non-metals are insulators.

EASY

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

Sn, C,

Si, Ge

are all group

XIV

elements. Yet,

Sn

is a conductor,

C

is an insulator while

Si

and

Ge

are semiconductors.Why?

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

In a semiconductor

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Important Questions on Solutions

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