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Chemistry

Chemistry · Quick practice · answer shown after each question

Redox: oxidation numbers and balancing

Question 1 of 10

Question 1 of 10

Balance the redox equation MnO₄⁻ + Fe²⁺ + H⁺ → Mn²⁺ + Fe³⁺ + H₂O using half-equations. Identify the oxidising and reducing agents.

Question 2 of 10

Question 2 of 10

What is the oxidation number of S in SO₂?

Question 3 of 10

Question 3 of 10

Hydrogen peroxide can act as both an oxidising and a reducing agent.

Question 4 of 10

Question 4 of 10

Acidified potassium manganate(VII) changes colour from

Question 5 of 10

Question 5 of 10

The oxidation number of Cr in K₂Cr₂O₇ is ___.

Question 6 of 10

Question 6 of 10

What is the oxidation number of N in NO₃⁻?

Question 7 of 10

Question 7 of 10

Reduction is

Question 8 of 10

Question 8 of 10

The oxidation number of hydrogen in metal hydrides such as NaH is +1.

Question 9 of 10

Question 9 of 10

What is the oxidation number of Fe in Fe₂O₃?

Question 10 of 10

Question 10 of 10

What is the oxidation number of S in SO₄²⁻?

Questions written by OtisamLMS in the style of the WASSCE. They are not WAEC past questions.