Which of the following substances does not release $O_2$ and acts as a dehydrating agent?

Which of the following explanations is best for not placing hydrogen with alkali metals or halogens?

Complete the following chemical reactions:
$(i) \ PbS_{(s)} + H_2O_{2_{(aq)}} \to $
$(ii) \ MnO_{4_{(aq)}}^{-} + H_2O_{2_{(aq)}} \to $
$(iii) \ CaO_{(s)} + H_2O_{(g)} \to $
$(iv) \ AlCl_{3_{(g)}} + H_2O_{(l)} \to $
$(v) \ Ca_3N_{2_{(s)}} + H_2O_{(l)} \to $
Classify the above into $(a)$ hydrolysis,$(b)$ redox and $(c)$ hydration reactions.

Metals like $Pt$ and $Pd$ can adsorb large volumes of hydrogen under specific conditions. Such adsorbed hydrogen by the metal is known as:

Hydrogen forms a stable diatomic molecule like which elements?

Hydrogen readily combines with non-metals and thus it shows its