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JAMB UTME Chemistry 2007 past questions and answers

This 2007 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 2007 set with instant marking.

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Sample JAMB UTME Chemistry 2007 questions

1. What volume of 0.50 mol dm-3 NaOH is required to neutralize 25.0 cm3 of 0.20 mol dm-3 H2SO4?
  1. 10.0 cm3
  2. 20.0 cm3
  3. 25.0 cm3
  4. 50.0 cm3

Answer: B. 20.0 cm3

The acid contains 0.0050 mol H2SO4 and needs 0.0100 mol NaOH, which occupies 0.0200 dm3.

2. What is the oxidation number of sulfur in the sulfite ion, SO3^2-?
  1. +2
  2. +3
  3. +4
  4. +6

Answer: C. +4

If sulfur has oxidation number x, then x + 3(-2) = -2, giving x = +4.

3. During the electrolysis of molten lead(II) bromide, which product forms at the cathode?
  1. Bromine molecules
  2. Hydrogen gas
  3. Lead(IV) ions
  4. Lead metal

Answer: D. Lead metal

Pb2+ ions gain two electrons at the cathode to form lead metal.

4. Which is the correct unit for a rate expressed as change in concentration per unit time?
  1. mol dm-3 s-1
  2. mol dm3 s-1
  3. dm3 mol-1 s-1
  4. mol s dm-3

Answer: A. mol dm-3 s-1

Dividing concentration in mol dm-3 by time in seconds gives mol dm-3 s-1.

5. For an exothermic reversible reaction at equilibrium, what happens when the temperature is increased?
  1. The equilibrium shifts towards products
  2. The equilibrium shifts towards reactants
  3. The equilibrium constant becomes zero
  4. The reaction stops completely

Answer: B. The equilibrium shifts towards reactants

Adding heat favors the endothermic reverse reaction, shifting the equilibrium towards reactants.

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