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NECO SSCE Chemistry 2005 past questions and answers

This 2005 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 2005 set with instant marking.

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Sample NECO SSCE Chemistry 2005 questions

1. What volume of 0.10 mol dm-3 hydrochloric acid will exactly neutralize 25.0 cm3 of 0.20 mol dm-3 sodium hydroxide?
  1. 50.0 cm3
  2. 25.0 cm3
  3. 12.5 cm3
  4. 100 cm3

Answer: A. 50.0 cm3

The base contains 0.0050 mol NaOH, so 0.0050 mol HCl is needed, which occupies 0.050 dm3 at 0.10 mol dm-3.

2. A 2.4 g sample of magnesium (Ar = 24) reacts completely with excess dilute hydrochloric acid; what volume of hydrogen is produced at STP, where one mole of gas occupies 22.4 dm3?
  1. 0.224 dm3
  2. 2.24 dm3
  3. 11.2 dm3
  4. 22.4 dm3

Answer: B. 2.24 dm3

The magnesium amount is 2.4/24 = 0.10 mol and the equation gives one mole of hydrogen per mole of magnesium, so the gas volume is 2.24 dm3.

3. When an exothermic reaction occurs in an insulated beaker, which observation is most likely?
  1. The reaction mixture absorbs heat from the surroundings
  2. The temperature of the mixture must fall
  3. The temperature of the mixture rises
  4. No energy is transferred

Answer: C. The temperature of the mixture rises

An exothermic reaction releases heat, raising the temperature of the reaction mixture when heat loss is limited.

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

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

A catalyst speeds a reaction by providing a pathway with lower activation energy without being consumed overall.

5. For the equilibrium N2(g) + 3H2(g) ⇌ 2NH3(g), what is the effect of increasing pressure at constant temperature?
  1. The equilibrium shifts towards ammonia
  2. The equilibrium shifts towards nitrogen and hydrogen
  3. The equilibrium position does not change
  4. The ammonia decomposes completely

Answer: A. The equilibrium shifts towards ammonia

Higher pressure favours the side with fewer gas molecules, and the ammonia side has two moles of gas compared with four on the reactant side.

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