DP Chemistry (last assessment 2024)

Question 20N.2.sl.TZ0.1b(v)

b(v).

[Maximum mark: 2]

20N.2.sl.TZ0.1b(v)

Chlorine undergoes many reactions.

$2.67 g$ of manganese(IV) oxide was added to $200.0 {cm}^{3}$ of $2.00 mol {dm}^{- 3} HCl$ .

${MnO}_{2} (s) + 4 HCl (aq) \to {Cl}_{2} (g) + 2 H_{2} O (l) + {MnCl}_{2} (aq)$

(b(v))

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

[2]

Markscheme

${MnO}_{2} : + 4$ ✔

${MnCl}_{2} : + 2$ ✔

Examiners report

The majority of candidates were able to determine the oxidation states of Mn in the two compounds correctly.

Syllabus sections