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NECO SSCE Chemistry 2004 past questions and answers

This 2004 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 2004 set with instant marking.

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Sample NECO SSCE Chemistry 2004 questions

1. What amount in moles is present in 12 g of magnesium? (Mg = 24)
  1. 0.50 mol
  2. 2.0 mol
  3. 12 mol
  4. 24 mol

Answer: A. 0.50 mol

Amount = mass / molar mass = 12 / 24 = 0.50 mol.

2. At room temperature and pressure, 0.25 mol of a gas occupies 6.0 dm3; what volume would 0.50 mol occupy under the same conditions?
  1. 3.0 dm3
  2. 12.0 dm3
  3. 6.0 dm3
  4. 24.0 dm3

Answer: B. 12.0 dm3

At constant temperature and pressure, gas volume is proportional to amount, so doubling the moles doubles the volume to 12.0 dm3.

3. An atom of sodium has mass number 23 and atomic number 11; how many neutrons does it contain?
  1. 11
  2. 23
  3. 12
  4. 34

Answer: C. 12

Neutron number is mass number minus proton number, so 23 - 11 = 12.

4. What generally happens to atomic radius as one moves from left to right across a period in the periodic table?
  1. It increases because shells are added
  2. It remains exactly constant
  3. It increases because shielding rises greatly
  4. It decreases because nuclear attraction on the same shell becomes stronger

Answer: D. It decreases because nuclear attraction on the same shell becomes stronger

Across a period proton number increases while electrons enter the same main shell, increasing attraction and reducing atomic radius.

5. Which description best explains the bonding in magnesium oxide?
  1. Magnesium transfers two electrons to oxygen, forming oppositely charged ions
  2. Magnesium and oxygen share one pair of electrons
  3. Oxygen transfers two protons to magnesium
  4. Magnesium atoms are held to oxygen atoms only by weak intermolecular forces

Answer: A. Magnesium transfers two electrons to oxygen, forming oppositely charged ions

Magnesium forms Mg2+ by losing two electrons and oxygen forms O2- by gaining them, and electrostatic attraction holds the ions together.

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