Question

In which reaction is hydrogen acting as an oxidising agent?

• A. With ioding to give hydrogen iodide
• B. With litium to give lithium hydride
• C. With nitrogen to give ammonia
• D. With sulphur to give hydrogen sulphide

Answer 1

Answer: (B)

With litium to give lithium hydride

$\underset{0}{H_2}+\underset{0}{I_2}⟶\underset{-1+1}{HI}$ Here oxidation of

$\underset{0}{eLi}+\underset{0}{H_2}⟶\underset{+1}{2Li}\underset{-1}{H}$ Lithium takes place by conversion from $0$ to $+1$

$\underset{0}{N_2}+\underset{0}{3H_2}⟶\underset{-3}{2N}\underset{-1}{H_3}$ $\therefore$ Hydrogen acts as

$N_2+S⟶H_2\underset{-2}{S}$ oxidising agent in option B.

Ans :- Option B.