Question

Oxidation state of hydrogen is zero in

• A. $Ca{H}_2$
• B. $NaH$
• C. $Pd{H}_2$
• D. $N{H}_3$

Answer 1

Answer: (C)

$H_2$ is adsorbed in $Pd$-surface. Thus, it is in molecular state with oxidation number of $H=0$