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In each reaction, name the substance that is oxidised and the one that is reduced…

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In each reaction, name the substance that is oxidised and the one that is reduced.

$\text{PbO} + \text{H}_2 \rightarrow \text{Pb} + \text{H}_2\text{O}$
$2\text{Al} + \text{Cr}_2\text{O}_3 \rightarrow \text{Al}_2\text{O}_3 + 2\text{Cr}$
$2\text{Ca} + \text{O}_2 \rightarrow 2\text{CaO}$

Need a reminder? The key ideaShow

Oxidation is a gain of oxygen or a loss of hydrogen; reduction is a loss of oxygen or a gain of hydrogen. They happen together. The oxidising agent gives oxygen (or takes hydrogen) and is itself reduced; the reducing agent takes oxygen (or gives hydrogen) and is itself oxidised.

The worked solution

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In each reaction, name the substance that is oxidised and the one that is reduced…

The worked solution

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