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NECO SSCE Chemistry 2015 past questions and answers

This 2015 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 2015 set with instant marking.

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Sample NECO SSCE Chemistry 2015 questions

1. In the Haber process, which pair of gases reacts to form ammonia?
  1. Nitrogen and hydrogen
  2. Nitrogen and oxygen
  3. Hydrogen and chlorine
  4. Ammonia and oxygen

Answer: A. Nitrogen and hydrogen

Nitrogen combines with hydrogen in the Haber process according to N2 + 3H2 ⇌ 2NH3.

2. Which statement best describes a thermoplastic polymer when heated?
  1. It decomposes instantly without softening
  2. It becomes permanently cross-linked
  3. It softens and can be moulded again
  4. It changes into a metal

Answer: C. It softens and can be moulded again

Thermoplastics soften on heating and can be reshaped because their polymer chains are not permanently cross-linked.

3. A lake receives excessive nitrate and phosphate from farm runoff; which change is most likely to follow?
  1. The water becomes permanently distilled
  2. Rapid algal growth followed by oxygen depletion
  3. All dissolved salts precipitate immediately
  4. The lake gains a higher boiling point

Answer: B. Rapid algal growth followed by oxygen depletion

Excess nutrients can cause algal blooms, and decomposition of the algae uses dissolved oxygen.

4. When ethanol reacts with ethanoic acid in the presence of concentrated sulfuric acid, what are the main products?
  1. Ethene and carbon dioxide
  2. Methanol and oxygen
  3. Ethanal and hydrogen
  4. Ethyl ethanoate and water

Answer: D. Ethyl ethanoate and water

Ethanol and ethanoic acid undergo esterification to produce ethyl ethanoate and water.

5. Which observation identifies an alkene when it is shaken with bromine water at room temperature in the absence of ultraviolet light?
  1. The orange-brown colour disappears
  2. A blue precipitate forms
  3. A white gas is released
  4. The solution turns deep purple

Answer: A. The orange-brown colour disappears

The carbon-carbon double bond adds bromine, decolourising the orange-brown bromine water.

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