IB Chemistry SL 3.1.6 Oxidation States Questions

Use real exam questions to assign oxidation states from formulas and charges, then interpret average and changing values.

Exam points

Determine an element’s oxidation state in a neutral compound or polyatomic ion by assigning known oxidation states and balancing the overall charge.
Calculate and interpret an average oxidation state in a compound, including mixed-valence species such as Fe3O4, and distinguish the constituent oxidation states when supported.
Deduce oxidation-state changes or use oxidation states to identify a compound, ion, formula or systematic name, reporting the required Roman-numeral notation.

[Maximum number: 2]

Chlorine undergoes many reactions.

2.67 g of manganese(IV) oxide was added to $200.0 \mathrm{~cm}^{3}$ of $2.00 \mathrm{moldm} \mathrm{m}^{-3} \mathrm{HCl}$ .

\mathrm{MnO}_{2}(\mathrm{~s})+4 \mathrm{HCl}(\mathrm{aq}) \rightarrow \mathrm{Cl}_{2}(\mathrm{~g})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})+\mathrm{MnCl}_{2}(\mathrm{aq})

State the oxidation state of manganese in $\mathrm{MnO}_{2}$ and $\mathrm{MnCl}_{2}$ .
$\mathrm{MnO}_{2}:$ $\mathrm{MnCl}_{2}$ :

$\mathrm{MnO}_{2}:+4$ $\mathrm{MnCl}_{2}:+2$

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