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JAMB UTME Chemistry 2026 past questions and answers

This 2026 JAMB UTME Chemistry set has 40 practice questions. Try these 5 free sample questions, tap a question to reveal the answer and explanation. Then practise the whole 2026 set with instant marking.

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Sample JAMB UTME Chemistry 2026 questions

1. In the Haber process, what is the main effect of the iron catalyst on the production of ammonia?
  1. It increases the rate at which equilibrium is reached without changing the equilibrium position.
  2. It increases the equilibrium yield by removing ammonia.
  3. It shifts the equilibrium towards nitrogen and hydrogen.
  4. It supplies the nitrogen required for the reaction.

Answer: A. It increases the rate at which equilibrium is reached without changing the equilibrium position.

An iron catalyst provides an alternative pathway with lower activation energy, speeding both forward and reverse reactions without changing the equilibrium composition.

2. Which catalyst is commonly used for the oxidation of sulfur dioxide to sulfur trioxide in the Contact process?
  1. Finely divided iron
  2. Vanadium(V) oxide
  3. Nickel
  4. Manganese(IV) oxide

Answer: B. Vanadium(V) oxide

Vanadium(V) oxide catalyses the reversible oxidation of sulfur dioxide to sulfur trioxide in the Contact process.

3. The hydrocarbon fractions in crude oil are separated mainly by fractional distillation because they have different
  1. densities at room temperature.
  2. chemical formulae but identical boiling points.
  3. boiling-point ranges.
  4. solubilities in water.

Answer: C. boiling-point ranges.

Crude-oil hydrocarbons have different boiling-point ranges, so they condense at different heights in a fractionating column.

4. Which description best represents the formation of poly(ethene) from ethene?
  1. Condensation polymerization with elimination of water
  2. Substitution that replaces hydrogen atoms with chlorine
  3. Cracking that forms smaller alkane molecules
  4. Addition polymerization in which the C=C bonds open and link the monomers

Answer: D. Addition polymerization in which the C=C bonds open and link the monomers

Ethene molecules undergo addition polymerization as their double bonds open to form a long chain without eliminating a small molecule.

5. A mixture of iodine crystals and sand is heated gently. Which method can recover the iodine from the mixture?
  1. Sublimation
  2. Decantation
  3. Filtration
  4. Separating funnel

Answer: A. Sublimation

Iodine sublimes on heating and can be collected as crystals on a cool surface, while sand remains behind.

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