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Waec Gce 2026 Chemistry Questions and Answers

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WAEC GCE 2026 Chemistry Examination Schedule:

Monday, 5th October, 2026
Chemistry 2 (Essay) – 2hrs – 09:30 hrs – 11:30 hrs.
Chemistry 1 (Objective) – 1hr – 11:30 hrs – 12:30 hrs.

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Waec Gce 2026 Chemistry Questions and Answers

(1a)
(i) Carbon monoxide (CO)
(ii) Carbon (soot)

(1bi)
Dissolve in water and filter.

(1bii)
Sublimation

(1ci)
CH₂=CHCl

(1cii)
Addition polymerization.

(1di)
Structural isomers are compounds with the same molecular formula but different structural formulae.

(1dii)
(i) Butane
CH₃ — CH₂ — CH₂ — CH₃

(ii) Methylpropane
CH₃
|
CH₃ — CH — CH₃

(1e)
Check the image

(1fi)
2s and 2p orbitals

(1fii)
Maximum number of electrons is 8

(1gi)
Impurities raise the boiling point.

(1gii)
Impurities lower the melting point.

(1hi)
Oxygen molecule: O₂

(1hii)
Oxide ion: O²⁻

(1i)
(i) Diesel and water: Separating funnel
(ii) Marble chips and sulphur powder: Sieve

(1f)
(i) The rates of the forward and reverse reactions are equal.
(ii) The concentrations of the reactants and products remain constant.

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Waec Gce 2026 Chemistry Questions and Answers

NUMBER 2

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Waec Gce 2026 Chemistry Questions and Answers

NUMBER 3

(3ai)
zinc hydroxychloride

(3aii)
is a double salt.

(3aiii)
(i) Basic salt — Zn(OH)Cl
(ii) Amphoteric oxide — Al₂O₃
(iii) Complex salt — [Cu(NH₃)₄]SO₄

(3bi)
(i) CH₃CHOHCH₂CH₃ — Secondary alkanol
(ii) CH₃CH₂CH₂OH — Primary alkanol
(iii) (CH₃)₂COHCH₂CH₃ — Tertiary alkanol

(3bii)
(i) CH₃CH₂CH₂OH (primary alcohol): orange solution changes to green.
(ii) (CH₃)₂COHCH₂CH₃ (tertiary alcohol): no colour change.

(3ci)
(i) Carbon dating: ¹⁴C
(ii) Reference scale for determining relative atomic mass: ¹²C

(3cii)
Ar = [(12 × 98.90) + (13 × 1.10)] / 100
= (1186.8 + 14.3) / 100
= 1201.1 / 100
= 12.011

(3di)
(α) Hydrogen bromide:
C₂H₅Br — bromoethane

(β) Acidified potassium tetraoxomanganate(VII):
CO₂ + H₂O

(γ) Acidified water:
C₂H₅OH — ethanol

(3dii)
Polyethene (polyethylene)

(3diii)
(i) Making plastic bags.
(ii) Making bottles/containers.

(3e)
(i) Observation
(ii) Formulation of hypothesis
(iii) Experimentation
(iv) Conclusion

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Waec Gce 2026 Chemistry Questions and Answers

NUMBER 4

(4ai)
(i) Carbon monoxide – CO
(ii) Carbon dioxide – CO₂

(4aii)
I – CO
II – CO₂
III – CO

(4bi)
(i) Bituminous coal
(ii) Anthracite

(4bii)
(i) Coal tar
(ii) Ammoniacal liquor

(4ci)
Ammonium nitrite — NH₄NO₂

(4cii)
NH₄NO₂ → N₂ + 2H₂O

(4ciii)
(i) Manufacture of ammonia
(ii) Providing an inert atmosphere

(4di)
Haematite — Fe₂O₃

(4dii)
(i) Coke
(ii) Limestone

(4diii)
Hot air supports the combustion of coke and produces heat and carbon monoxide.

(4div)
Fe₃O₄ + 4CO → 3Fe + 4CO₂
Molar mass of Fe₃O₄ = (3 × 56) + (4 × 16) = 232 g/mol
Moles of Fe₃O₄ = 5.80 ÷ 232 = 0.025 mol
Moles of Fe = 0.025 × 3 = 0.075 mol
Mass of Fe = 0.075 × 56
= 4.20 g

(4ei)
(i) Diamond has a giant covalent structure.
(ii) It contains strong covalent bonds requiring much energy to break.

(4eii)
(i) Lubricant: Its layers can slide over one another easily.
(ii) Electrode: It conducts electricity.

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