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NECO SSCE Chemistry 2001 past questions and answers

This 2001 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 2001 set with instant marking.

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Sample NECO SSCE Chemistry 2001 questions

1. A fixed mass of gas is kept at constant temperature. If its pressure is doubled, what happens to its volume?
  1. It doubles
  2. It is halved
  3. It remains unchanged
  4. It becomes four times as large

Answer: B. It is halved

At constant temperature, Boyle's law states that pressure is inversely proportional to volume.

2. Atoms of the same element that have different mass numbers must have different numbers of which particles?
  1. Protons
  2. Electrons in neutral atoms
  3. Nuclear charges
  4. Neutrons

Answer: D. Neutrons

Isotopes have the same number of protons but different numbers of neutrons.

3. What amount of substance is present in 14.9 g of potassium chloride, KCl? (K = 39, Cl = 35.5)
  1. 0.20 mol
  2. 0.40 mol
  3. 2.00 mol
  4. 4.00 mol

Answer: A. 0.20 mol

The molar mass of KCl is 74.5 g/mol, so 14.9/74.5 = 0.20 mol.

4. Which equation correctly represents the reaction of magnesium with oxygen to form magnesium oxide?
  1. Mg + O2 -> MgO2
  2. Mg + O -> MgO
  3. 2Mg + O2 -> 2MgO
  4. Mg2 + O2 -> 2MgO

Answer: C. 2Mg + O2 -> 2MgO

Two magnesium atoms combine with one oxygen molecule to give two formula units of magnesium oxide.

5. Across Period 3 from sodium to chlorine, what generally happens to atomic radius?
  1. It increases steadily
  2. It decreases overall
  3. It remains exactly constant
  4. It first doubles and then stays constant

Answer: B. It decreases overall

Across a period, increasing nuclear charge attracts the electrons more strongly while they occupy the same main shell.

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