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NECO SSCE Chemistry 2000 past questions and answers

This 2000 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 2000 set with instant marking.

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Sample NECO SSCE Chemistry 2000 questions

1. Which statement best describes a pure substance?
  1. It contains only one kind of particle and has a fixed composition.
  2. It must be a mixture of two elements.
  3. Its composition changes whenever it is heated.
  4. It can be separated into components by filtration.

Answer: A. It contains only one kind of particle and has a fixed composition.

A pure substance has a definite composition and characteristic properties, unlike a mixture.

2. A mixture of sand and sodium chloride is stirred with water and filtered; which procedure then recovers solid sodium chloride?
  1. Separating the filtrate with a magnet.
  2. Evaporating the filtrate to dryness.
  3. Adding more sand to the filtrate.
  4. Filtering the filtrate through finer paper.

Answer: B. Evaporating the filtrate to dryness.

The salt dissolves in water and remains in the filtrate, so evaporation leaves the solid salt behind.

3. An atom has atomic number 17 and mass number 37; how many neutrons does it contain?
  1. 17
  2. 20
  3. 37
  4. 54

Answer: B. 20

The number of neutrons is mass number minus atomic number, giving 37 - 17 = 20.

4. Which subatomic particle has a relative charge of -1 and a very small mass compared with a proton?
  1. Neutron
  2. Proton
  3. Electron
  4. Nucleus

Answer: C. Electron

An electron carries a relative charge of -1 and has a much smaller mass than either a proton or neutron.

5. Elements in the same group of the periodic table generally have similar chemical properties because they have the same number of
  1. occupied shells.
  2. neutrons.
  3. protons plus neutrons.
  4. outer-shell electrons.

Answer: D. outer-shell electrons.

For main-group elements, the number of valence electrons largely determines similar chemical behavior within a group.

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