Question

Hydrogen undergoes both reduction and oxidation when reacted with:

• A. S
• B. $N_2$
• C. $O_2$
• D. $F_2$

Answer 1

Answer: (C)

$O_2$

When oxygen is added to hydrogen, both oxidation and reduction of the hydrogen take place. It forms $H^{+}$ and $O{H}^{-}$ ions.

$2H_2+O_2\to 2H^{+}+2O{H}^{-}$

Here $H^{+}$ is formed by reduction of the hydrogen and $O{H}^{-}$ ion is formed by oxidation of hydrogen.