Ethiopia Grade 12 Chemistry Unit 1: Solutions Question Answers

Ethiopia Grade 12 Chemistry Unit 1: Solutions Question Answers:  Text Book Practice the sample multiple-choice question for Grade 12 Chemistry Entrance examination.

Ethiopia Grade 12 Chemistry

Unit 1: Solutions

1. What is the meaning of Mg(OH)₂ 

• A) Milk of Magnesia
• B) Magnesium
• C) Hydroxide
• D) All of the above

Answers: A) Milk of Magnesia Magnesium hydroxide is the inorganic compound with the chemical formula Mg(OH)₂. It occurs in nature as the mineral brucite.

2. A colloid consists of two parts

• A) True
• B) False

Answers: A) True: A colloid is a mixture in which one substance of microscopically dispersed insoluble particles is suspended throughout another substance.

3. Which is an example of a colloid?

• A) Milk,
• B) Jelly,
• C) Muddy water,
• D) All of the above

Answers: D) All of the above

4. The light beam can pass through the colloidal mixture.

• A) True
• B) False

Answers: A) True

5. Which is an example of a gas?

• A) Air,
• B) Water,
• C) Muddy water,
• D) Alcoholic beverage

Answers: A) Air

6. Which is an example of a liquid?

• A) Acetone
• B) Water,
• C) Ethanol
• D) All of the above

Answers: D) All of the above

7. Match the following

Solutions	Example
A) gas-gas	I) Coca-cola
B)liquid-liquid	II) Air
C) Gas-liquid	III) alloys
D) Solid-liquid	IV) Water
E)solid-solid	V) Saltwater

Answers:

• A) : II)
• B) : IV)
• C) : I)
• D): V)
• E) : III)

8) Ethanol mixed with water but old does not. Why?

• A) Because both are Miscible liquids
• B) Because of prominent solvent
• C) Because of  like dissolves like
• D) Because of  dislike dissolves like

Answers: C. “Like dissolves like” is an expression used by chemists. It refers to “polar” and “nonpolar” solvents and solutes. Basic example: Water is polar. Oil is non-polar. Water will not dissolve oil.

09. Which of the following is NOT an immiscible liquids

• A) Oil and Water
• B) Pentane and Acetic Acid
• C) Benzene and Carbon tetrachloride
• D) All of the above

Answers: C) Benzene (C₆H₆ ) and Carbon tetrachloride (CCl₄) these two liquids are said to be miscible

10.) London forces refer to

• A) Acting between atoms and molecules
• B) It is a temporary attractive force
• C) its the is the weakest intermolecular force.
• D) All of the above

Answers: D) The LDF (London Dispersion Force) is named after the German-American physicist Fritz London.

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Self Practice Question Unit 1: Solutions

1. A solution is a:

• A) heterogeneous mixture
• B) homogeneous
• C) Suspension
• D) colloid

2.  Soda water is an example of:

• A) liquid-liquid
• B) solid-liquid solution
• C) gzs-liquid solution
• D) gas-gas solution

3. Which of the following substances are not readily miscible within each Other’?

• A) C₆H₆ and CCl₄
• B) C₂H₅OH and CCl₄
• C) C₂H₅OH and H₂O
• D) CH₃OH and H₂O

4. Rate of dissolution is largely dependent upon

• A) the inter-particle forces
• B) the Surface area of Solid Solute
• C) the temperature of the system
• D) the pressure of the system

5. the quantitative relationship between gas solubility and pressure is given by:

• A) Raoult’s law
• B) Henry’s law
• C) Hess’s law
• D) Dalton’s law

6. When a non-volatile solute is added to a pure solvent the:

• A) vapour pressure Ofthe Solvent decreases.
• B) vapour pressure Ofthe solvent increases.
• C) boiling point Ofthe Solution decreases.
• D) freezing point of the solution increases.

7. Which of the following is not true about ideal solutions?

• A) the volume of an ideal solution is the sum Of the volume Ofits pure components
• B) there is no expansion or contraction on mixing
• C) the heat of solutiion is zero
• D) they deviate Raoult’s law