logo

Cambridge IGCSE Chemistry practice

Paper 4 structured question: Redox

Try the question first, then check the answer and practise the same topic again.

Attempt questionRedox revisionRevise the key idea

At a glance

4

Paper

2

Marks

Topic

Redox

Exam-style question

Try this first

Paper 4Theory (Extended)2 marks

Consider the compound H2O.

Description

Oxidation Numbers in H2O

Identify the oxidation numbers of hydrogen and oxygen in H2O.

  1. a

    Explain the oxidation numbers of hydrogen and oxygen in H2O.

    Aim for approximately 2 distinct marking points.

    [2]

0 of 1 part answered

Answer every part before opening the mark scheme.

Common mistake

No common mistake is linked to this question yet.

Related flashcards

Flashcard 1 of 6

Press Space to flip, arrows to move

Related practice questions

Question 1 of 5

Choose an answer, get feedback, then move sideways through the set.

0 of 4 attempted

Paper 4 structured question: Redox

Paper 4Theory (Extended)1 marks

Description

Oxidation Number Rules

1. Uncombined elements have an oxidation number of 0. 2. The oxidation number of a monatomic ion equals its charge. 3. The total oxidation numbers in a compound sum to 0. 4. The total oxidation numbers in an ion equal its charge.

  1. a

    State the oxidation number of an uncombined element.

    Aim for approximately 1 distinct marking point.

    [1]