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NECO SSCE Chemistry 2008 past questions and answers

This 2008 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 2008 set with instant marking.

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Sample NECO SSCE Chemistry 2008 questions

1. What product is formed when ethene reacts with steam in the presence of a phosphoric acid catalyst?
  1. Ethanol
  2. Ethanoic acid
  3. Ethane
  4. Ethanal

Answer: A. Ethanol

Hydration adds water across the ethene double bond to form ethanol.

2. For a reversible reaction at equilibrium, what is the effect of adding a catalyst?
  1. It increases the equilibrium yield of products
  2. It speeds up the forward and reverse reactions equally without shifting equilibrium
  3. It shifts equilibrium toward the side with more molecules
  4. It stops the reverse reaction

Answer: B. It speeds up the forward and reverse reactions equally without shifting equilibrium

A catalyst speeds both directions equally and does not change the equilibrium composition.

3. In the cell Zn(s)|Zn2+(aq)||Cu2+(aq)|Cu(s), which substance is oxidized as the cell operates?
  1. Cu2+ ions
  2. Copper metal
  3. Zinc metal
  4. Zinc ions

Answer: C. Zinc metal

Zinc atoms lose electrons to form Zn2+ ions, so zinc is oxidized.

4. Why does powdered calcium carbonate react faster with dilute hydrochloric acid than the same mass of marble chips?
  1. The powder has a higher density
  2. The powder is a stronger acid
  3. The powder produces more gas molecules per formula unit
  4. The powder exposes a larger surface area to the acid

Answer: D. The powder exposes a larger surface area to the acid

Powdering increases exposed surface area and therefore the frequency of effective collisions.

5. Which functional group is present in ethanoic acid?
  1. -COOH
  2. -OH
  3. -CHO
  4. -COO-

Answer: A. -COOH

Ethanoic acid is a carboxylic acid and contains the -COOH group.

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