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.
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
good but have some eror!