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NECO SSCE Chemistry 2002 past questions and answers

This 2002 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 2002 set with instant marking.

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Sample NECO SSCE Chemistry 2002 questions

1. An ion has 11 protons, 12 neutrons and 10 electrons. Which species is it?
  1. Na+
  2. Na
  3. Mg2+
  4. F-

Answer: A. Na+

Eleven protons identify sodium, and one fewer electron than protons gives a +1 charge.

2. Which statement correctly describes two isotopes of the same element?
  1. They have different numbers of protons and the same number of neutrons.
  2. They have the same number of protons but different numbers of neutrons.
  3. They have the same mass number but different atomic numbers.
  4. They have different chemical symbols and identical electron arrangements.

Answer: B. They have the same number of protons but different numbers of neutrons.

Isotopes share an atomic number but differ in neutron number and therefore usually in mass number.

3. What is the formula of the compound formed from Al3+ and O2- ions?
  1. AlO
  2. AlO2
  3. Al2O3
  4. Al3O2

Answer: C. Al2O3

Two Al3+ ions and three O2- ions balance the total charge to zero.

4. What are the smallest whole-number coefficients for Fe + O2 -> Fe2O3, in that order?
  1. 2, 1, 1
  2. 2, 3, 2
  3. 3, 2, 1
  4. 4, 3, 2

Answer: D. 4, 3, 2

The balanced equation is 4Fe + 3O2 -> 2Fe2O3, which conserves both iron and oxygen atoms.

5. How many moles of water are present in 9.0 g of H2O? (H=1, O=16)
  1. 0.50 mol
  2. 2.0 mol
  3. 9.0 mol
  4. 18 mol

Answer: A. 0.50 mol

Water has molar mass 18 g mol-1, so 9.0 g contains 9.0/18 = 0.50 mol.

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