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NECO SSCE Chemistry 2022 past questions and answers

This 2022 NECO SSCE 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 2022 set with instant marking.

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Sample NECO SSCE Chemistry 2022 questions

1. During electrolysis of molten lead(II) bromide, which product is formed at the cathode?
  1. Lead
  2. Bromine
  3. Oxygen
  4. Hydrogen

Answer: A. Lead

Lead(II) ions gain electrons at the cathode to form lead atoms.

2. What is the oxidation number of sulphur in H2SO4?
  1. +4
  2. +6
  3. -2
  4. +2

Answer: B. +6

The two hydrogen atoms contribute +2 and the four oxygen atoms contribute -8, so sulphur must be +6.

3. What effect does a suitable catalyst have on the activation energy of a reaction?
  1. It increases the activation energy
  2. It makes the reaction endothermic
  3. It provides an alternative pathway with lower activation energy
  4. It increases the enthalpy change

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

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

4. For the equilibrium N2(g) + 3H2(g) <=> 2NH3(g), an increase in pressure at constant temperature shifts equilibrium in which direction?
  1. To the left, where there are more gas molecules
  2. There is no shift because pressure is unchanged
  3. Equally in both directions
  4. To the right, where there are fewer gas molecules

Answer: D. To the right, where there are fewer gas molecules

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

5. For 2H2(g) + O2(g) -> 2H2O(l), delta H is -572 kJ; how much heat is released when 1 mol of hydrogen reacts completely?
  1. 286 kJ
  2. 572 kJ
  3. 1144 kJ
  4. 143 kJ

Answer: A. 286 kJ

The reaction releases 572 kJ for 2 mol of hydrogen, so 1 mol releases 286 kJ.

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