Hydrogen will not reduce:

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(D) The reactivity series of metals indicates that hydrogen can reduce oxides of metals that are less reactive than hydrogen. $Cu$,$Fe$,and $Sn$ are l

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Heated aluminium oxide

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(D) The reactivity series of metals indicates that hydrogen can reduce oxides of metals that are less reactive than hydrogen. $Cu$,$Fe$,and $Sn$ are less reactive than hydrogen,so their oxides ($CuO$,$Fe_2O_3$,$SnO_2$) can be reduced by $H_2$. However,$Al$ is more reactive than hydrogen,so $H_2$ cannot reduce $Al_2O_3$ to $Al$. Therefore,the correct option is $(D)$.

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