Grade 12 : Chemistry - Solutions (Set 1)

Question 1

What is a homogeneous mixture of two or more substances in which the components are uniformly distributed at a molecular level?

Accepted Answer

C) Solution

Answer

A) Suspension

Answer

B) Colloid

Answer

D) Emulsion

Question 2

In an aqueous solution of glucose, which component acts as the solvent?

Accepted Answer

B) Water

Answer

A) Glucose

Answer

C) Both are solvents

Answer

D) Neither is a solvent

Question 3

Which of the following concentration terms is defined as the number of moles of solute per liter of solution?

Accepted Answer

D) Molarity

Answer

A) Molality

Answer

B) Mole fraction

Answer

C) Mass percentage

Question 4

How does an increase in temperature generally affect the solubility of gases in liquids?

Accepted Answer

B) Decreases it

Answer

A) Increases it

Answer

C) Has no effect

Answer

D) First increases then decreases

Question 5

Which of the following is the best example of a solid-solid solution?

Accepted Answer

C) Brass

Answer

A) Saltwater

Answer

B) Air

Answer

D) Fog

Question 6

What is the standard unit for molality?

Accepted Answer

C) mol/kg

Answer

A) mol/L

Answer

B) g/L

Answer

D) mL/L

Question 7

Which characteristic defines an ideal solution?

Accepted Answer

C) Obeys Raoult's Law over the entire range of concentrations

Answer

A) Shows positive deviation from Raoult's Law

Answer

B) Shows negative deviation from Raoult's Law

Answer

D) Components react chemically

Question 8

Henry's Law relates the partial pressure of a gas to its solubility in a liquid. This law is commonly applied to which of the following?

Accepted Answer

B) Carbonated beverages

Answer

A) Dissolving salt in water

Answer

C) Sugar dissolving in tea

Answer

D) Mixing oil and water

Question 9

If 20 grams of sodium hydroxide (NaOH) are dissolved in 80 grams of water, what is the mass percentage of NaOH in the solution?

Accepted Answer

A) 20%

Answer

B) 25%

Answer

C) 80%

Answer

D) 100%

Question 10

Colligative properties of solutions depend primarily on which of the following factors?

Accepted Answer

C) The number of solute particles in the solution

Answer

A) The chemical nature of the solute

Answer

B) The type of solvent used

Answer

D) The density of the solution