Why does hydrogen occur in a diatomic form rather than in a monoatomic form under normal conditions ?
Hydrogen atom has only one electron and this has one electron less than the stable inert gas configuration of helium. Therefore to attain stable inert gas configuration of helium, it shares its single electron with electron of other hydrogen atom to form a stable diatomic molecule
What do you understand by the term 'auto-protolysis' of water? What is its significance?
How does $H_2O_2$ behave as a bleaching agent ?
Knowing the properties of $\mathrm{H}_{2} \mathrm{O}$ and $\mathrm{D}_{2} \mathrm{O}$, do you think that $\mathrm{D}_{2} \mathrm{O}$ can be used for drinking purposes?
Can phosphorus with outer electronic configuration $3 s^{2} 3 p^{3}$ form $\mathrm{PH}_{5} ?$
Write structure of Hydrogen peroxide.