A metal on combustion in excess air forms

Question:

A metal on combustion in excess air forms X, $\mathrm{X}$ upon hydrolysis with water yields $\mathrm{H}_{2} \mathrm{O}_{2}$ and $\mathrm{O}_{2}$ along with another product. The metal is :

  1. $\mathrm{Rb}$

  2. $\mathrm{Na}$

  3. $\mathrm{Mg}$

  4. Li


Correct Option: 1

Solution:

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