Chemical Compounds Quiz

Which of the following radicals would require two sodium ions (Na⁺) to form a neutral compound?

• NO₃⁻

• CO₃²⁻

• Cl⁻

• OH⁻

In which compound does the metal combine with two identical radicals?

• CaCO₃

• Mg(OH)₂

• NaNO₃

• AlCl₃

What is the correct formula of a compound formed between Al³⁺ and SO₄²⁻?

• AlSO₄

• Al₂(SO₄)₃

• Al₃(SO₄)₂

• Al(SO₄)₃

A compound has the formula X₃(PO₄)₂. What is the valency of element X?

• 2

• 3

• 1

• 4

Which of these compounds contains three different elements and at least one radical?

• HCl

• CaCO₃

• O₂

• Cl₂

The name “ammonium sulphate” corresponds to which formula?

• NH₄SO₄

• (NH₄)₂SO₄

• NH₄₂SO₄

• NH₄₂(SO₄)₃

What is the combining capacity (valency) of sulphur in H₂S?

• 1

• 2

• 4

• 6

Identify the correct match between the radical and its formula.

• Nitrate – NO₂⁻

• Sulphite – SO₄²⁻

• Carbonate – CO₃²⁻

• Phosphate – PO₃³⁻

Which of the following compounds contains both a cationic and anionic radical?

• NH₄Cl

• NaCl

• CO₂

• HCl

Which of the following is not necessary to write a chemical formula correctly?

• Atomic mass

• Symbol of element/radical

• Valency/combining capacity

• Charge on radicals