Compare hydrogen with alkali metals on the basis of :

(i) Ion formation

(ii) Reducing power

(iii) Reaction with oxygen

(iv) Oxide formation

(i) Hydrogen and Alkali metals both form a cation, by loss of an electron.

H ⟶ H⁺ + e^-

Li ⟶ Li⁺ + e^-

Na ⟶ Na⁺ + e^-

All these elements have electropositive character.

(ii) Both Hydrogen atoms and alkali metals are reducing agents.

CuO + H₂ ⟶ Cu + H₂O

CuO + 2Na ⟶ Cu + Na₂O

(iii) Both hydrogen and alkali metals react with oxygen to form respective oxides.

Hydrogen - forms H₂O

Sodium - forms Na₂O

(iv) Both alkali metals and Hydrogen burns in air to form oxides.

Hydrogen forms its oxide (water)

2H₂ + O₂ ⟶ 2H₂O

Sodium also forms its peroxide

2Na + O₂ ⟶ Na₂O₂