Question

In the following reaction, metal 'M' CANNOT be ____________.

\[\ce{M + O2 ->[\Delta] MO2}\]

Options

• Be and Ca

• Ba and Ra

• Sr and Ra

• Ba and Sr

Answer 1

In the following reaction, metal 'M' CANNOT be Be and Ca.

\[\ce{M + O2 ->[\Delta] MO2}\]

Explanation:

Beryllium is kinetically inert to the oxygen reaction, therefore it cannot easily create peroxide, but it can develop an oxide (BeO) layer on its surface. Be, Mg, and Ca create oxides [MO] when heated with pure oxygen, whereas Ba, Sr, and Ra form peroxides [MO₂].