IB Chemistry HL 3.1.6 Oxidation states Question Bank

Practise IB Chemistry HL 3.1.6 by analysing oxidation states in complex ions, redox systems and compounds with changing oxidation numbers.

Exam points

Deduce oxidation states in complex ions and compounds using charge balance and systematic notation.
Analyse oxidation-state changes to identify redox processes and explain electron transfer in chemical systems.

[Maximum number: 1]

Nitrous acid, $\mathrm{HNO}_{2}$ , is a weak acid which can be used to make acidic buffers.

A $1.00 \mathrm{~mol} \mathrm{dm}^{-3}$ solution of nitrous acid was prepared. This solution contains two conjugate acid-base pairs.

State the oxidation state of nitrogen in nitrous acid, $\mathrm{HNO}_{2}$ .

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