In which reaction is the underlined substance acting as an oxidising agent? A \underline{\text{CuO}} + \text{H}_2 \rightarrow \text{Cu} + \text{H}_2\text{O} B 2\underline{\text{Mg}} + \text{O}_2 \rightarrow 2\text{MgO} C 2\underline{\text{KI}} + \text{Br}_2 \rightarrow 2\text{KBr} + \text{I}_2 D \text{HCl} + \underline{\text{NaOH}} \rightarrow \text{NaCl} + \text{H}_2\text{O}

CH-1777

Oxidation states

Chemistry · Secondary 4 · Hard · Oxidation states

In which reaction is the underlined substance acting as an oxidising agent?

A

\underline{\text{CuO}} + \text{H}_2 \rightarrow \text{Cu} + \text{H}_2\text{O}

2\underline{\text{Mg}} + \text{O}_2 \rightarrow 2\text{MgO}

2\underline{\text{KI}} + \text{Br}_2 \rightarrow 2\text{KBr} + \text{I}_2

\text{HCl} + \underline{\text{NaOH}} \rightarrow \text{NaCl} + \text{H}_2\text{O}

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