IB Chemistry SL 3.1.6 Oxidation states Question Bank

Practise IB Chemistry SL 3.1.6 by assigning oxidation states and identifying how elements change in compounds and redox reactions.

Exam points

Assign oxidation states from formulae, ions and oxidation-number conventions accurately.
Identify oxidation and reduction by comparing element oxidation states before and after a reaction.

[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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