Ordinary level 2026 BAEBOC mock chemistry 2

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Physics Section 1 (Multiple Choice)

Directions: Each of these questions or incomplete statements in this section is followed by four suggested answers. Select the best answer for each question.

1. Which one of the following is a derived unit?

• A. Newton

• B. Meter

• C. Kilogram

• D. second

2. Length, mass and current are….

• A. units of measurement

• B. derived quantities

• C. fundamental quantities

• D. measured in metres, newton and ampere respectively

3. Which of the following sets contains only vector quantities?

• A. weight, displacement, acceleration

• B. energy, momentum, distance

• C. mass, force, speed

• D. specific heat capacity, power, time.

4. Figure 1 shows the resultant R of two forces P and Q. R makes an angle of $60^\circ$ with a horizontal.

Given that $R = 100\text{N}$. Which of the following is correct:

• A. magnitude of Q is $50\text{N}$

• B. magnitude of P is $50\text{N}$

• C. magnitude of P is $86.6\text{N}$

• D. P and Q are parallel to each other

5. An object of mass $50\text{kg}$ is pulled with a force of $100\text{N}$ on a smooth runway. Its acceleration is:

• A. $5000 \text{ ms}^{-2}$

• B. $150 \text{ ms}^{-2}$

• C. $2.0 \text{ ms}^{-2}$

• D. $0.5 \text{ ms}^{-2}$

6. When a person steps forward from rest, one foot pushes backwards on the ground. The ground will as a result push that foot

 

• A. backwards with an equal force

   

• B. forwards with an equal force

   

• C. backwards with a smaller force

   

• D. forwards with a smaller force

   

7. Figure 2 shows a uniform metre rule of weight $2\text{N}$ pivoted at the $40\text{cm}$ mark.

The value of the force, P required to keep the metre rule in equilibrium when a force $4\text{N}$ acts at the other end as shown is:

• A. $2.5 \text{ N}$

• B. $5.5 \text{ N}$

• C. $6.0 \text{ N}$

• D. $6.5 \text{ N}$

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Chemistry Section B & C

Laboratory Preparation of Gases

b) You are expected to prepare and collect a dry sample of chlorine gas in the laboratory. You are provided with the following: Two flat bottom flask and one round bottom flask, delivery tubes, gas jar, thistle funnel, concentrated hydrochloric acid, manganese(iv)oxide, concentrated sulphuric acid, water and heat source.

• Task: Draw or describe an experimental set-up you will use to prepare and collect a dry sample of the gas.

Separation Techniques

c) Complete the table below by selecting the most convenient techniques for separating the mixtures:

Mixture	Separation Technique
Kerosene and petrol
Potassiumnitrate and Sodiumchloride
Sulphur and iron filings
Sodiumchloride and water

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Section C (Theory)

Answer ONLY TWO questions in this section.

8. The following methods are used to prepare salts:

• a) Actions of acids on metals

• b) Neutralization

• c) Double decomposition

For each method give an example a salt and describe how you will prepare pure dry samples of the salt in the laboratory.

9. Briefly distinguish between the following pairs as used in chemistry. You should include suitable examples, illustration or equations.

• a) Esterification and saponification

• b) Allotropy and isomerism

• c) Addition polymerisation and condensation polymerisation

• d) Thermal dissociation and thermal decomposition

10. Briefly describe how the following metals are extracted from a named ore:

• a) Iron

• b) Copper

• Give two large scale uses of each metal.