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JAMB UTME Chemistry 2008 past questions and answers

This 2008 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 2008 set with instant marking.

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Sample JAMB UTME Chemistry 2008 questions

1. When a fuel burns completely in oxygen, the reaction is exothermic because it
  1. transfers heat to the surroundings
  2. absorbs heat from the surroundings
  3. has no energy transfer
  4. converts all heat into light

Answer: A. transfers heat to the surroundings

Combustion releases energy to the surroundings, so it is exothermic.

2. Why does increasing the temperature usually increase the rate of a chemical reaction?
  1. It lowers the concentration of every reactant.
  2. A larger fraction of particles has energy at least equal to the activation energy.
  3. It makes the activation energy of every reaction zero.
  4. It prevents collisions between reactant particles.

Answer: B. A larger fraction of particles has energy at least equal to the activation energy.

At higher temperature, more particles can make successful collisions by exceeding the activation energy.

3. For N2(g) + 3H2(g) ⇌ 2NH3(g), what is the effect of increasing the pressure at constant temperature?
  1. The equilibrium shifts to the left because that side has fewer gas molecules.
  2. The equilibrium position does not change because all substances are gases.
  3. The equilibrium shifts to the right because that side has fewer gas molecules.
  4. The equilibrium shifts to the right because that side has more gas molecules.

Answer: C. The equilibrium shifts to the right because that side has fewer gas molecules.

Higher pressure favours the side with fewer gaseous molecules, which is the ammonia side.

4. What are the products when dilute hydrochloric acid reacts completely with calcium carbonate?
  1. Calcium chloride and hydrogen
  2. Calcium hydroxide and chlorine
  3. Calcium oxide and water
  4. Calcium chloride, water and carbon dioxide

Answer: D. Calcium chloride, water and carbon dioxide

An acid reacting with a carbonate forms a salt, water and carbon dioxide.

5. In terms of electron transfer, oxidation is best described as
  1. loss of electrons
  2. gain of electrons
  3. gain of neutrons
  4. loss of protons

Answer: A. loss of electrons

Oxidation involves loss of electrons.

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