Chemistry Tuition Singapore O level Chemistry Tuition – Oxidation and Reduction Common Misconception

Misconception 1

The oxidation number of hydrogen is 1 and the oxidation number of oxygen is 2.

Correct Conception 1

The `+’ and `—’ signs must be shown. Thus, the oxidation number of hydrogen is +1 and the oxidation number of oxygen is —2.

Misconception 2

A substance is always an oxidising agent or a reducing agent in all reactions.

Correct Conception 2

Some substances, such as sulfur dioxide, SO₂, hydrogen peroxide, H₂0₂, and sodium nitrite, NaNO₂, can act as both oxidising and reducing agents.

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