Cameroon GCE advanced level June 2026 chemistry 1

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Chemistry Multiple Choice Questions (1 – 12)

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

Question 1

Which of the following pairs can be used to prepare primary standard solutions?

• A Potassium iodate and Oxalic acid

• B Hydrochloric acid and Sodium carbonate

• C Sodium hydroxide and hydrochloric acid

• D Sulphuric acid and sodium tetraborate

Question 2

How many atoms are found in a mole of oxygen molecules?

• A $6.022 \times 10^{23}$

• B $6.022 \times 10^{22}$

• C $12.044 \times 10^{23}$

• D $1.2044 \times 10^{22}$

Question 3

The series of lines that fall in the visible region of the hydrogen emission spectrum are called?

• A Brackett series

• B Lyman series

• C Paschen series

• D Balmer series

Question 4

According to the octet rule, how many electrons do atoms tend to get in their outermost shell during bonding?

• A 10

• B 8

• C 16

• D 2

Question 5

Enthalpy of reaction can be defined as the:

• A heat evolved when 1 mole of reactants are converted to products

• B heat released or absorbed when 1 mole of reactants are converted to 1 mole of products

• C heat evolved or absorbed when the number of moles of reactants as indicated in the chemical equation have completely reacted

• D enthalpy change when a mole reactants in their normal physical states is converted to products.

Question 6

Select the most suitable techniques used in the determination of crystal structures?

• A X-ray diffraction by electrons in crystals

• B X-ray diffraction by protons in crystals.

• C X-ray diffraction by neutrons in crystals

• D X-ray diffraction by atoms of the crystal

Question 7

The minimum amount of energy required to initiate a chemical reaction is:

• A standard heat of formation

• B bond energy

• C activation energy

• D lattice energy

Question 8

Consider the following reversible reaction:

The equilibrium concentrations are: $[\text{CO}] = 1.03\text{ M}$, $[\text{H}_2] = 0.32\text{ M}$ and $[\text{CH}_3\text{OH}] = 1.56\text{ M}$. Calculate the equilibrium constant, $K_c$:

• A 4.72

• B 14.5

• C 0.07

• D 0.21

Question 9

A precise explanation for the trend in atomic radius across the period sodium to chlorine is:

• A Decreases due to increase in effective nuclear charge

• B Decreases due to decrease in number of electrons

• C Increases due to increase in the number of shells

• D Decreases due to decrease in effective nuclear charge

Question 10

The elements with atomic numbers 18 and 26 have their outermost electrons in which orbitals respectively?

• A p and d

• B p and s

• C s and d

• D s and f

Question 11

Given are the outer electronic configurations, which of these elements will form an amphoteric oxide?

• A $3s^2 3p^2$

• B $3s^2 3p^1$

• C $3s^2 3p^3$

• D $3s^2 3p^4$

Question 12

Which of the following carbonates is the most unstable?

• A $\text{BeCO}_3$

• B $\text{CsCO}_3$

• C $\text{Li}_2\text{CO}_3$

• D $\text{BaCO}_3$