Chemistry IGCSE grade 9

• It is Oxidised.

• It is Reduced.

• It is neither Oxidised nor Reduced.

• True.

• False

What is the charge of a Fe (III) ion?

• +3

• -3

• 0

• 0

• -2

• +2

• +8

• 0

• +6

• -6

The oxidation state of oxygen in the compound H₂O₂ is?

• 0

• +2

• -2

• -1

What is the oxidation state of the polyatomic ion SO₄?

• 0

• +2

• -2

• Endothermic

• Exothermic