HARD

Earn 100

$50 mL$ of $0.2$ molal urea solution (density $= 1.012 g {mL}^{- 1}$ at $300 K$ ) is mixed with $250 mL$ of a solution containing $0.06 g$ of urea. Both the solutions were prepared in the same solvent. The osmotic pressure (in torr) of the resulting at $300 K$ is

[Use : Molar mass of urea $= 60 g {mol}^{- 1}$ ; gas constant, $R = 62 L - torr K^{- 1} {mol}^{- 1}$ ;

Assume, $Δ_{mix} H = 0, Δ_{mix} V = 0]$

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Important Questions on Solutions

HARD

Chemistry>Physical Chemistry>Solutions>Osmosis and Osmotic Pressure

Which of the following pairs of solution is isotonic?

(molar mass. urea $= 60$ , sucrose $= 342 g {mol}^{- 1}$ )

MEDIUM

Chemistry>Physical Chemistry>Solutions>Osmosis and Osmotic Pressure

The osmotic pressure of a solution of

NaCl

0.10

atm and that of a glucose solution is

0.20

atm. The osmotic pressure of a solution formed by mixing

1 L

of the sodium chloride solution with

2 L

of the glucose solution is

x \times 10^{- 3}

atm.

x

is ________ (nearest integer)

EASY

Chemistry>Physical Chemistry>Solutions>Osmosis and Osmotic Pressure

300 K

, a one litre solution of sucrose (molecular weight:

342

) was prepared by dissolving

40 g

of sucrose. What is the approximate osmotic pressure (in

kPa

) of the solution at the same temperature?

(R = 8.314 \times 10^{6} {cm}^{3} Pa K^{- 1} {mol}^{- 1})

MEDIUM

Chemistry>Physical Chemistry>Solutions>Osmosis and Osmotic Pressure

0.1 M

solution of

NaCl

is isotonic with

1.1 w %

urea solution, the degree of ionisation of

NaCl

is (Molar masses of urea and

NaCl

are

60

and

58.5 g {mol}^{- 1}

, respectively.)

MEDIUM

Chemistry>Physical Chemistry>Solutions>Osmosis and Osmotic Pressure

A solution is prepared by dissolving 0.6 g of urea (molar mass

= 60 g m o l^{- 1}

) and

1.8 g

of glucose (molar mass

= 180 g m o l^{- 1}

) in 100 mL of water at

27^{o} C .

The osmotic pressure of the solution is:
(

R = 0.08206 L

atm

K^{- 1} m o l^{- 1}

)

MEDIUM

Chemistry>Physical Chemistry>Solutions>Osmosis and Osmotic Pressure

T (K)

, which one of the following pairs of solutions is isotonic?

MEDIUM

Chemistry>Physical Chemistry>Solutions>Osmosis and Osmotic Pressure

Which of the following pair of solutions is isotonic?

MEDIUM

Chemistry>Physical Chemistry>Solutions>Osmosis and Osmotic Pressure

Solution of

' A'

containing

3 \cdot 42 g

of it in

100 {cm}^{3}

of water is found to be isotonic with a

6.84 %

(W / v)

solution of sucrose, what is the molar mass of '

' A' ?

(at. wt;

C = 12, H = 1, 0 = 16

)

MEDIUM

Chemistry>Physical Chemistry>Solutions>Osmosis and Osmotic Pressure

Which of the following sets of solutions of urea

(mol . mass 60 g {mol}^{- 1})

and sucrose

(mol . mass 342 g {mol}^{- 1})

is isotonic?

EASY

Chemistry>Physical Chemistry>Solutions>Osmosis and Osmotic Pressure

The size of a raw mango shrinks to a much smaller size when kept in a concentrated salt solution. Which one of the following process can explain this?

EASY

Chemistry>Physical Chemistry>Solutions>Osmosis and Osmotic Pressure

0.02

molar solution of

NaCl

having degree of dissociation of

90 %

27 ° C

has osmotic pressure equal to

HARD

Chemistry>Physical Chemistry>Solutions>Osmosis and Osmotic Pressure

The observed osmotic pressure for a

0.10 M

solution of

Fe ({NH}_{4})_{2} ({SO}_{4})_{2}

25 ° C

10.8 atm

. The expected and experimental (observed) values of Van't Hoff factor '

i

' will be respectively;

(R = 0.082 L atm k^{-} {mol}^{- 1})

EASY

Chemistry>Physical Chemistry>Solutions>Osmosis and Osmotic Pressure

Isotonic solutions are solutions having the same

HARD

Chemistry>Physical Chemistry>Solutions>Osmosis and Osmotic Pressure

8.9 g

KCl

dissolved in

1 L

of water exhibited an apparent degree of ionization of

0.86

. The osmotic pressure exhibited by this solution is equal to the osmotic pressure of

1 L

glucose solution of unknown concentration. Calculate the glucose solution concentration in

wt . %,

(M . wt . of KCl = 74.5)

EASY

Chemistry>Physical Chemistry>Solutions>Osmosis and Osmotic Pressure

Solutions

A, B, C

and

D

are

0.1 M

glucose,

0.05 M NaCl, 0.05 M {BaCl}_{2}

and

0.1 M {AlCl}_{3}

respectively. Which one of the following pairs is isotonic (at the same temperature)?

EASY

Chemistry>Physical Chemistry>Solutions>Osmosis and Osmotic Pressure

The following solutions were prepared by dissolving

10 g

of glucose

(C_{6} H_{12} O_{6})

250 mL

of water

(P_{1}), 10 g

of urea

({CH}_{4} N_{2} O)

250 mL

of water

(P_{2})

and

10 g

of sucrose

(C_{12} H_{22} O_{11})

250 mL

of water

(P_{3}) .

The right option for the decreasing order of osmotic pressure of these solutions is:

EASY

Chemistry>Physical Chemistry>Solutions>Osmosis and Osmotic Pressure

At certain temperature $1.6 %$ solution of an unknown substance is isotonic with $2.4 %$ solution of Urea. If both the solutions have the same solvent and both the solutions have same density $1 gm / {cm}^{3},$ what will be the molecular mass of unknown substance in $gm {mol}^{- 1} .$

[Molecular mass of urea $= 60 gm {mol}^{- 1}$ ]

MEDIUM

Chemistry>Physical Chemistry>Solutions>Osmosis and Osmotic Pressure

250 {cm}^{3}

of an aqueous solution containing

0.73 g

of a protein

A

is isotonic with one litre of another aqueous solution containing

1.65 g

of a protein

B,

298 K

, the ratio of the molecular masses of

A

and

B

___________\times 10^{- 2}

(to the nearest integer).

MEDIUM

Chemistry>Physical Chemistry>Solutions>Osmosis and Osmotic Pressure

The osmotic pressure of a dilute solution of an ionic compound

X Y

in water is four times that of a solution

0.01 M B a C l_{2}

in water. Assuming complete dissociation of the given ionic compounds in water, the concentration of

X Y

(

i n m o l L^{- 1}

) in solution is

EASY

Chemistry>Physical Chemistry>Solutions>Osmosis and Osmotic Pressure

The osmotic pressure of solution containing 34.2 g of cane sugar (molar mass =

342 g m o l^{- 1}

in 1L of solution at

20^{o}

C is

(G i v e n, R = 0.082 L a t m K^{- 1} m o l^{- 1})

Important Questions on Solutions

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