(D) Aluminium oxide $(Al_2O_3)$ cannot be reduced by hydrogen even under very hot conditions because $Al$ is more reactive than $H$. Hydrogen can only

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(D) Aluminium oxide $(Al_2O_3)$ cannot be reduced by hydrogen even under very hot conditions because $Al$ is more reactive than $H$. Hydrogen can only reduce metal oxides of metals that are less reactive than hydrogen in the metal reactivity series,such as $Cu$,$Fe$,and $Sn$.