Question

A metal on combustion in excess air forms $X,X$ upon hydrolysis with water yields $H_2{O}_2$ and $O_2$ along with another product. The metal is:

• A. $Rb$
• B. $Na$
• C. $Mg$
• D. $Li$

Answer 1

Answer: (A)

$Rb$

The metal is $Rb$.

$Rb+O_{2\left(excess\right)}\to Rb{O}_2$

Here product $X$ is $Rb{O}_2$.

$2Rb{O}_2+2H_{2}O\to 2RbOH+H_2{O}_2+O_2$.