Solutions Test

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Solutions Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

Which of these is not a colligative property?

A
Freezing point

B
Depression in freezing point

C
Elevation of boiling point

D
Osmotic pressure

Solution

Colligative properties depend only on number of ions and not on the nature of ions.

Therefore, freezing point is not the colligative property as it depends on the nature of the substance and not on the number of particles.
Question 2
1 / -0

Solid potassium chloride is added to water until no more can be dissolved at that temperature. Some solid remains at the bottom of the beaker. How would you describe the solution?

A
It is a concentrated solution.

B
It is an unsaturated solution.

C
It is a saturated solution.

D
It is a heterogeneous solution.

Solution

Saturated solution is the solution that contains maximum amount of solute that can be dissolved in a given solution at a certain temperature.
If more quantity of solute is added to saturated solution, it will not be dissolved in it.
Question 3
1 / -0

On addition of 6.00 g of a solid to 30.0 mL of water. The solid has a molar mass of 72.0 g/mol. What is the molar concentration of the solution? Mass of 1 ml water is 1 g.

A
2.78 mol/L

B
0.00278 mol/L

C
0.00250 mol/L

D
0.360 mol/L

Solution

Mass of solid = 6g

Molar mass of solid = 72 g

Moles of solid = 6/72 = 0.0834 mol

Volume of water = 30 ml = 30/1000 L = 0.03L

Molarity = moles of solute / volume of solution(L)

Molarity = 0.0834 / 0.03 = 2.78 M
Question 4
1 / -0

What is the concentration, in % (m/v) of a solution containing 15.0 g KCl in 600.0 mL solution?

A
5.00%

B
2.00%

C
0.200%

D
2.50%

Solution

Mass of KCl = 15g

Volume of solution = 600ml

Mass / volume percent is the mass of solute in 100 ml of solution.

15 g of solute is in 600 ml of solution.

m/v % = (mass of solute (g)) / volume of solution (ml) X 100

m/v % = 15/600 * 100 = 2.5%
Question 5
1 / -0

Calculate the osmotic pressure for 0.1 M CaCl₂ solution?

A
0.2RT

B
0.1RT

C
0.3RT

D
0.4RT

Solution

Van’t Hoff factor for CaCl₂ is 3 because it dissociates into Ca²⁺ and 2 Cl^-.

The value of osmotic pressure = iCRT

Osmotic pressure = 3 x 0.1 x RT = 0.3RT