The GCE Chemistry exam tests candidates on chemical reactions, atomic structure, bonding, stoichiometry, and gas laws. Below are 10 carefully solved GCE Chemistry questions to prepare for the 2026 examination.

Question 1: Reactions of Alkynes

Q1. The type of reaction alkynes mainly undergo is:
A) Addition
B) Oscillation
C) Esterification
D) Substitution

Solution:
Alkynes contain triple bonds, which are unsaturated and reactive. They easily undergo addition reactions, where atoms are added to the carbon–carbon triple bond.
Correct Answer: A (Addition).

Question 2: Gas Laws

Question 3: Formation of Ions

Q3. Chlorine atom forms chloride ion by:
A) Donating lone pair of electrons
B) Accepting one electron
C) Sharing two electrons
D) Losing two electrons

Solution:
A chlorine atom has 7 valence electrons and needs 1 more to complete its octet. It accepts one electron to form a chloride ion (Cl⁻).
Correct Answer: B (Accepting one electron).

Question 4: Atomic Structure

Q4. The number of protons in the nucleus of an atom is called its:
A) Atomic number
B) Mass number
C) Isotope number
D) Valency

Solution:
The atomic number is defined as the number of protons in the nucleus of an atom, which determines the element’s identity.
Correct Answer: A (Atomic number).

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Question 5: Organic Chemistry

Q5. The homologous series to which ethene belongs is:
A) Alkanes
B) Alkenes
C) Alkynes
D) Aromatics

Solution:
Ethene (C₂H₄) contains a double bond, making it a member of the alkene homologous series.
Correct Answer: B (Alkenes).

Question 6: Electrolysis

Q6. During the electrolysis of acidified water, the gas evolved at the cathode is:
A) Oxygen
B) Hydrogen
C) Chlorine
D) Carbon dioxide

Solution:
At the cathode (negative electrode), hydrogen ions (H⁺) are reduced to form hydrogen gas.
Correct Answer: B (Hydrogen).

Question 7: Stoichiometry

Question 8: Acids and Bases

Q8. A substance that turns red litmus paper blue is a:
A) Base
B) Acid
C) Neutral oxide
D) Salt

Solution:
Bases are alkaline and turn red litmus blue.
Correct Answer: A (Base).

Question 9: Oxidation and Reduction

Q9. Which of the following is an example of oxidation?
A) Addition of hydrogen
B) Loss of oxygen
C) Gain of oxygen
D) Removal of chlorine

Solution:
Oxidation is defined as the gain of oxygen or loss of hydrogen.
Correct Answer: C (Gain of oxygen).

Question 10: Chemical Equilibrium

Q10. At equilibrium, the rate of the forward reaction is:
A) Greater than the backward reaction
B) Equal to the backward reaction
C) Less than the backward reaction
D) Zero

Solution:
At dynamic equilibrium, the forward and backward reactions occur at the same rate.
Correct Answer: B (Equal to the backward reaction).

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Conclusion

These 10 solved GCE Chemistry questions cover organic chemistry, atomic structure, stoichiometry, gas laws, electrolysis, and equilibrium. They mirror the style of the 2026 GCE Chemistry exam and provide excellent practice.

Keywords

• GCE Chemistry 2025 questions
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• Boyle’s law Chemistry past questions

Credit: Allschool, Allcbt

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