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NECO SSCE Chemistry 2013 past questions and answers

This 2013 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 2013 set with instant marking.

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Sample NECO SSCE Chemistry 2013 questions

1. What is the general molecular formula of an open-chain alkane containing n carbon atoms?
  1. C_nH_(2n+2)
  2. C_nH_(2n)
  3. C_nH_(2n-2)
  4. C_nH_n

Answer: A. C_nH_(2n+2)

An acyclic alkane is saturated and has the general formula C_nH_(2n+2).

2. What happens when ethene is shaken with bromine water in the absence of ultraviolet light?
  1. The solution turns blue-black
  2. The orange colour is decolorized
  3. A white precipitate forms
  4. A gas with a rotten-egg smell is produced

Answer: B. The orange colour is decolorized

Ethene adds bromine across its carbon-carbon double bond, removing bromine water's orange colour.

3. Which pair of substances reacts to form ethyl ethanoate and water?
  1. Ethene and water
  2. Ethanal and oxygen
  3. Ethanol and ethanoic acid
  4. Ethane and carbon dioxide

Answer: C. Ethanol and ethanoic acid

Ethanol reacts with ethanoic acid in an esterification reaction to form ethyl ethanoate and water.

4. Why does soap form scum and lather poorly in hard water?
  1. Hard water evaporates the soap
  2. Soap decomposes into carbon dioxide
  3. Soap becomes an acid in water
  4. Calcium and magnesium ions form insoluble salts with soap

Answer: D. Calcium and magnesium ions form insoluble salts with soap

Calcium and magnesium ions in hard water react with soap anions to produce insoluble scum.

5. Which monomer is used to make poly(ethene)?
  1. Ethene
  2. Ethanol
  3. Ethanoic acid
  4. Ethane

Answer: A. Ethene

Many ethene molecules join by opening their double bonds to form poly(ethene).

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