Solutions Test

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Solutions Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

The mole fraction of solvent in a solution having 6 moles of sugar dissolved in 18 moles of solvent is

A
0.75

B
0.25

C
0.50

D
1.00

Solution

Mole fraction of Solvent = Moles of solvent / Total number of moles in solution

= 18/24 = 0.75
Question 2
1 / -0

A solution in which no more solute can be dissolved at a given temperature and pressure is called a saturated solution. At saturated solution stage equilibrium gets established among which two processes?

A
Evaporation and condensation

B
Dissolution and crystallisation

C
Sublimation and crystallisation

D
Dissolution and condensation

Solution

At saturated solution stage equilibrium gets established among dissolution and crystallisation.
Question 3
1 / -0

The molal elevation constant is the elevation in boiling point of

A
1M solution

B
1m solution

C
1N solution

D
None of the above

Solution

ΔT_b = K_b m

when molality, m = 1, ΔT_b = K_b
Question 4
1 / -0

If a cell is placed in a hypotonic solution, water will flow

A
Into the cell

B
No transfer of water is observed

C
Into and out of the cell at equal rates

D
Out of the cell

Solution

Since in hypotonic solution osmotic pressure is less water will flow into the cell and cell will swell.
Question 5
1 / -0

Molarity of a solutions relates the

A
moles of solute and solvent

B
moles of solution and mass of solution

C
volume of solution and moles of solute

D
volume of solute and of volume of solvent

Solution

Molarity is no. of moles of solute dissolved per litre of solution.
Question 6
1 / -0

4g of two non volatile solutes A and B are separately dissolved in 100g of a given solvent. Which of the two shows higher elevation in boiling point if molar mass of A is more than that of B?

A
Boiling point remains unchanged

B
Both have same elevation in B.P.

C
Solution containing A

D
Solution containing B

Solution

Solution containing B shows greater elevation in boiling point as ΔT_bα 1/M.
Question 7
1 / -0

A solution is prepared by dissolving 28g of sugar in 172g of water Calculate the mass percentage of solute.

A
14%

B
86%

C
43%

D
28%

Solution

Mass percentage of solute = ( Mass of solute / Mass of solution) x 100

= 28/200 x 100= 14%
Question 8
1 / -0

"The solubility of a gas is directly proportional to the pressure of the gas". The above statement is based upon

A
Raoult's law

B
Henry's law

C
Kohlrausch law

D
None of these

Solution

This is the statement of Henry's law.
Question 9
1 / -0

The hard shell of an egg is dissolved in acetic acid and then the egg was subsequently placed in saturated solution of NaCl

A
The egg will become harder

B
No Change in the size of egg

C
The egg will swell

D
The egg will shrink

Solution

Molar concetration of solutes in a egg is less than the molar concentration of NaCl in a saturated solution. This is due to the very large molecular masses of the macromolecules present in the egg white or egg yellow. Due to lower concentration of solutes in egg, water will come out due to osmosis and egg will shrink.

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Re-Attempt Weekly Quiz Competition

Solutions Test - 4

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Solutions Test - 4

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SHARING IS CARING

Question 1

0.75

0.25

0.50

1.00

Solution

Question 2

Evaporation and condensation

Dissolution and crystallisation

Sublimation and crystallisation

Dissolution and condensation

Solution

Question 3

1M solution

1m solution

1N solution

None of the above

Solution

Question 4

Into the cell

No transfer of water is observed

Into and out of the cell at equal rates

Out of the cell

Solution

Question 5

moles of solute and solvent

moles of solution and mass of solution

volume of solution and moles of solute

volume of solute and of volume of solvent

Solution

Question 6

Boiling point remains unchanged

Both have same elevation in B.P.

Solution containing A

Solution containing B

Solution

Question 7

14%

86%

43%

28%

Solution

Question 8

Raoult's law

Henry's law

Kohlrausch law

None of these

Solution

Question 9

The egg will become harder

No Change in the size of egg

The egg will swell

The egg will shrink

Solution

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