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WAEC WASSCE Chemistry 2000 past questions and answers

This 2000 WAEC WASSCE 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 WAEC WASSCE Chemistry 2000 questions

1. Which method is most suitable for separating insoluble sand from a sample of salt solution?
  1. Filtration
  2. Crystallization
  3. Simple distillation
  4. Paper chromatography

Answer: A. Filtration

Sand remains on the filter paper while the salt solution passes through.

2. Atoms of the same element that have different mass numbers must have different numbers of
  1. protons
  2. neutrons
  3. electrons in neutral atoms
  4. protons and electrons

Answer: B. neutrons

Isotopes have the same proton number but different neutron numbers.

3. What is the electronic configuration of a neutral sodium atom with atomic number 11?
  1. 2,7,2
  2. 2,6,3
  3. 2,8,1
  4. 2,8,2

Answer: C. 2,8,1

The eleven electrons fill the shells as 2, 8, and 1.

4. What generally happens to atomic radius as elements are considered from left to right across a period?
  1. It increases because more shells are added
  2. It remains constant
  3. It increases because shielding rises greatly
  4. It decreases because nuclear attraction on the electrons increases

Answer: D. It decreases because nuclear attraction on the electrons increases

Across a period the proton number rises while electrons enter the same main shell, pulling them closer to the nucleus.

5. Which property is characteristic of an ionic compound such as sodium chloride?
  1. It conducts electricity when molten but not when solid
  2. It conducts electricity only in the solid state
  3. It has a low melting point because its particles are uncharged
  4. It consists of molecules held together by weak forces only

Answer: A. It conducts electricity when molten but not when solid

Ions are fixed in place in the solid but can move and carry charge in the molten liquid.

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