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NECO SSCE Chemistry 2011 past questions and answers

This 2011 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 2011 set with instant marking.

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Sample NECO SSCE Chemistry 2011 questions

1. Aqueous copper(II) sulfate is electrolysed using inert graphite electrodes; which substance is deposited at the cathode?
  1. Oxygen
  2. Copper
  3. Sulfur
  4. Hydrogen only

Answer: B. Copper

Cu2+ ions gain electrons at the cathode to form copper metal.

2. When ethanol is heated with ethanoic acid in the presence of concentrated sulfuric acid, what is the main organic product?
  1. Ethene
  2. Ethanal
  3. Ethanoate ion
  4. Ethyl ethanoate

Answer: D. Ethyl ethanoate

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

3. For N2(g) + 3H2(g) ⇌ 2NH3(g), what happens to the equilibrium position when pressure is increased at constant temperature?
  1. It shifts to the right
  2. It shifts to the left
  3. It does not change
  4. The ammonia decomposes completely

Answer: A. It shifts to the right

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

4. Which pair of metals are the principal constituents of brass?
  1. Iron and carbon
  2. Tin and lead
  3. Copper and zinc
  4. Copper and tin

Answer: C. Copper and zinc

Brass is an alloy made mainly from copper and zinc.

5. In the reaction Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s), which species is oxidised?
  1. Cu2+
  2. Cu
  3. Zn
  4. Zn2+

Answer: C. Zn

Zinc loses two electrons and its oxidation state rises from 0 to +2.

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