Grade 12 : Chemistry - Solutions (Set 4)

Question 1

The graph below shows the solubility curve for Compound X in water.

Based on the solubility curve, what is the approximate solubility of Compound X at $40^{\circ} ext{C}$?

Accepted Answer

C) 40 g/100 g water

Answer

A) 20 g/100 g water

Answer

B) 30 g/100 g water

Answer

D) 50 g/100 g water

Question 2

A chemist is diluting a stock solution. The initial and final conditions are provided in the table below.

Initial Concentration ($M$)	Initial Volume (mL)	Final Volume (mL)	Final Concentration ($M$)
2.5	100	500	?

Calculate the final concentration of the solution after dilution.

Accepted Answer

B) 0.50 M

Answer

A) 0.25 M

Answer

C) 1.25 M

Answer

D) 5.00 M

Question 3

Consider the following data for preparing an aqueous solution:

Initial Concentration ($M$)	Initial Volume (mL)	Final Volume (mL)	Final Concentration ($M$)
2.5	100	500	?

What is the molarity of the Sodium Chloride solution?

Accepted Answer

D) 2.0 M

Answer

A) 0.5 M

Answer

B) 1.0 M

Answer

C) 1.5 M

Question 4

A student prepares a solution using the following components:

Initial Concentration ($M$)	Initial Volume (mL)	Final Volume (mL)	Final Concentration ($M$)
2.5	100	500	?

Calculate the molality of the glucose solution.

Accepted Answer

A) 0.4 m

Answer

B) 0.2 m

Answer

C) 0.1 m

Answer

D) 0.05 m

Question 5

The graph illustrates the vapor pressure of a pure solvent and two different aqueous solutions (Solution A and Solution B) at various temperatures. Assume Solution A's curve is below Solution B's curve, and both are below the pure solvent curve.

Which statement is true regarding the concentration of Solution A and Solution B? Assume both solutes are non-volatile and non-electrolytes.

Accepted Answer

A) Solution A is more concentrated than Solution B.

Answer

B) Solution B is more concentrated than Solution A.

Answer

C) Both solutions have the same concentration.

Answer

D) Information is insufficient to compare concentrations.

Answer

E) Solution B has a higher vapor pressure than Solution A at any given temperature.

Question 6

A U-tube apparatus is set up with a semi-permeable membrane separating two compartments. Compartment 1 contains a 0.1 M glucose solution, and Compartment 2 contains a 0.5 M glucose solution.

In which direction will the net flow of water occur due to osmosis?

Accepted Answer

A) From Compartment 1 to Compartment 2

Answer

B) From Compartment 2 to Compartment 1

Answer

C) No net flow of water will occur

Answer

D) Water will flow equally in both directions

Question 7

Three different aqueous solutions, each with a molality of 0.1 m, are prepared.

Initial Concentration ($M$)	Initial Volume (mL)	Final Volume (mL)	Final Concentration ($M$)
2.5	100	500	?

Rank these solutions from highest freezing point to lowest freezing point.

Accepted Answer

B) 1 > 2 > 3

Answer

A) 3 > 2 > 1

Answer

C) 2 > 1 > 3

Answer

D) 1 = 2 = 3

Question 8

A student is trying to determine the boiling point of an aqueous solution. Given the following data:

Initial Concentration ($M$)	Initial Volume (mL)	Final Volume (mL)	Final Concentration ($M$)
2.5	100	500	?

What is the boiling point of the aqueous solution?

Accepted Answer

A) $100.256^{\circ}	ext{C}$

Answer

B) $100.412^{\circ}	ext{C}$

Answer

C) $100.512^{\circ}	ext{C}$

Answer

D) $100.128^{\circ}	ext{C}$

Question 9

The graph shows the solubility of a gas in water as a function of its partial pressure above the solution at a constant temperature.

If the Henry's Law constant ($k_H$) for the gas is 0.05 mol/(L atm) at $25^{\circ} ext{C}$, what is the solubility of the gas when its partial pressure above the solution is 0.4 atm?

Accepted Answer

B) 0.02 M

Answer

A) 0.01 M

Answer

C) 0.04 M

Answer

D) 0.05 M

Question 10

Observe the two beakers containing an aqueous solution of a gas (e.g., CO2) at different temperatures. Beaker 1 is at $20^{\circ} ext{C}$ and Beaker 2 is at $80^{\circ} ext{C}$. Assume all other conditions are identical.

Which of the following statements correctly describes the solubility of the gas in these two beakers?

Accepted Answer

A) The solubility of the gas is higher in Beaker 1.

Answer

B) The solubility of the gas is higher in Beaker 2.

Answer

C) The solubility is the same in both beakers.

Answer

D) The solubility depends on the volume of the gas, not temperature.