Solutions Test 13

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Solutions Test 13

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Weekly Quiz Competition

Question 1
1 / -0

What is the osmotic pressure of a solution containing 3.42 g of cane sugar in 1litre solution at 27°C .Molar mass of cane sugar is 342 g.

A
0.246 atm

B
2.46 atm

C
0.2 atm

D
1 atm

Solution

The correct answer is Option A.
Π = (W / M * V) * R * T
Π = (3.42 / 345 * 1 L) * 300 K * 0.0821
= 0.02463 atm
Question 2
1 / -0

What is the effect of temperature on the osmotic pressure of solution?

A
It decreases with increase in temperature

B
It decreases very very slowly with increase in temperature

C
No effect of temperature

D
It increases with increase in temperature

Solution

The correct answer is option D
Osmotic pressure is calculated as:
π = CRT
where, π = Osmotic pressure
C = Concentration
R = Gas constant
T = Temperature.
It is evident from the equation that osmotic pressure is directly proportional to the temperature.
Question 3
1 / -0

Which of the following colligative property can provide molar mass of proteins ( or polymers or colloids) with greater precision?

A
Elevation of boiling point

B
Osmotic pressure

C
Relative lowering of vapour pressure

D
Depression of freezing point

Solution

The correct answer is Option B.
Measurement of osmotic pressure provides a method to determine molar masses of solutes. This method is widely used to determine molar masses of proteins, polymers and other macromolecules.
Question 4
1 / -0

Equal volume of 1 M urea and 1 M glucose are mixed. the mixture will have

A
Same osmotic pressure

B
Lower osmatic pressure

C
Higher osmotic pressure

D
None of these

Solution

The correct answer is option A
The mixture will have the same osmotic pressure as the two individual values.
π_urea=0.1×ST
π_glucose=0.1×ST
π_mix=(0.1ST+0.1ST) / 2
=0.1ST
Question 5
1 / -0

The process of movement of solvent through a semipermeable membrane from the solution to the pure solvent by applying excess pressure on the solution side is called

A
Association

B
Diffusion

C
Osmosis

D
Reverse osmosis

Solution

The correct answer is option D

The process of movement of solvent through a semipermeable membrane from the solution to the pure solvent by applying excess pressure on the solution side is called reverse osmosis.
Question 6
1 / -0

The osmotic pressure of one molar solution at 0°C is

A
11.5 atm

B
12.2atm

C
22.4atm

D
18.6atm
Question 7
1 / -0

Which one of the following processes is used for desalination of sea water ?

A
Electrophoresis

B
Osmosis

C
Reverse osmosis

D
Diffusion

Solution

The correct answer is Option C
Reverse osmosis also involves diffusion, making the process dependent on pressure, flow rate, and other conditions. Reverse osmosis is most commonly known for its use in drinking water purification from seawater, removing the salt and other effluent materials from the water molecules.
Question 8
1 / -0

On lowering of temperature of solution, the rate of osmosis decreases because

A
The velocity of solvent particles increases

B
The solute undergoes either dissociation or association

C
The rate of transfer of particle across semi permeable membrane decreases.

D
The viscosity of solvent increases.
Question 9
1 / -0

The phenomenon of flow of solvent molecules through a semi permeable membrane from pure solvent to solution is called

A
Association

B
Osmosis

C
Diffusion

D
Reverse osmosis

Solution

The correct answer is Option B
Osmosis can be defined as the spontaneous movement of solvent molecules through a semipermeable membrane from a lower-concentration solution to a higher-concentration solution.
Question 10
1 / -0

What is the molar mass of the non-electrolyte if 2 g of it when dissolved in 100 mL of solution has osmotic pressure of 0.1 atm at 27 °C?

A
4.29 g/mol

B
4.92 g/mol

C
4.92 kg/mol

D
4.1g/mol

Solution

The correct answer is option C
Osmotic pressure () = CRT =( W₂ x R x T) / (M₂ x V)
∴M₂ = ( W₂ x R x T) / ( x V)
= (2g x 0.082Latm/mol^k x 300k) /(0.1atm x 0.1L)
= 4920 g/mol
= 4.920 kg/ mol

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Re-Attempt Weekly Quiz Competition

Solutions Test 13

Result

Solutions Test 13

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Rank

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SHARING IS CARING

Question 1

0.246 atm

2.46 atm

0.2 atm

1 atm

Solution

Question 2

It decreases with increase in temperature

It decreases very very slowly with increase in temperature

No effect of temperature

It increases with increase in temperature

Solution

Question 3

Elevation of boiling point

Osmotic pressure

Relative lowering of vapour pressure

Depression of freezing point

Solution

Question 4

Same osmotic pressure

Lower osmatic pressure

Higher osmotic pressure

None of these

Solution

Question 5

Association

Diffusion

Osmosis

Reverse osmosis

Solution

Question 6

11.5 atm

12.2atm

22.4atm

18.6atm

Question 7

Electrophoresis

Osmosis

Reverse osmosis

Diffusion

Solution

Question 8

The velocity of solvent particles increases

The solute undergoes either dissociation or association

The rate of transfer of particle across semi permeable membrane decreases.

The viscosity of solvent increases.

Question 9

Association

Osmosis

Diffusion

Reverse osmosis

Solution

Question 10

4.29 g/mol

4.92 g/mol

4.92 kg/mol

4.1g/mol

Solution

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