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JAMB UTME Chemistry 2004 past questions and answers

This 2004 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 2004 set with instant marking.

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Sample JAMB UTME Chemistry 2004 questions

1. Hydrogen burns according to 2H2(g) + O2(g) -> 2H2O(g). If 6 dm3 of hydrogen reacts completely with excess oxygen at the same temperature and pressure, what volume of steam is formed?
  1. 3 dm3
  2. 6 dm3
  3. 9 dm3
  4. 12 dm3

Answer: B. 6 dm3

The equation shows equal mole and gas-volume ratios for H2 and H2O, so 6 dm3 of hydrogen forms 6 dm3 of steam.

2. A salt has a solubility of 20 g per 100 g of water at a certain temperature; how much of the salt can dissolve in 50 g of water at that temperature?
  1. 5 g
  2. 15 g
  3. 10 g
  4. 40 g

Answer: C. 10 g

The water mass is half of 100 g, so it dissolves half of 20 g, which is 10 g.

3. What is the concentration of sodium hydroxide if 20.0 cm3 of it exactly neutralizes 25.0 cm3 of 0.10 mol dm-3 hydrochloric acid?
  1. 0.080 mol dm-3
  2. 0.100 mol dm-3
  3. 0.200 mol dm-3
  4. 0.125 mol dm-3

Answer: D. 0.125 mol dm-3

The 1:1 reaction provides 0.0250 x 0.10 = 0.00250 mol NaOH in 0.0200 dm3, giving 0.125 mol dm-3.

4. How does a suitable catalyst increase the rate of a chemical reaction?
  1. It increases the energy of the reactant molecules
  2. It provides an alternative pathway with lower activation energy
  3. It permanently increases the equilibrium yield
  4. It raises the temperature of the reaction mixture

Answer: B. It provides an alternative pathway with lower activation energy

A catalyst speeds reaction by providing an alternative pathway with lower activation energy.

5. In the equilibrium N2(g) + 3H2(g) <=> 2NH3(g), what is the effect of removing ammonia as it forms, while other conditions remain constant?
  1. The equilibrium shifts to the right
  2. The equilibrium shifts to the left
  3. The equilibrium constant becomes zero
  4. The forward reaction stops

Answer: A. The equilibrium shifts to the right

Removing a product makes the system form more ammonia, so equilibrium shifts to the right.

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