Question

Which of the following metals is obtained by the reduction of metal oxide using hydrogen gas?

• A. $Cu$
• B. $Al$
• C. $Mg$
• D. $Fe$

Answer 1

The correct option is A $Cu$

Copper oxide can be reduced to copper using hydrogen, while oxides of metals like $Al,Mg$ and $Fe$ cannot be reduced because of their high reactivity. The standard reduction potential of $C{u}^{2+}/Cu$ system is more that that of hydrogen. Hence, it can be reduced to its metal by hydrogen gas.