CBSE 2023 · Region 1 · Set 1 · Q27

(a)

Identify the reducing agent in the following reactions :

(i)

$\displaystyle 4 \mathrm{NH}_{3}+5 \mathrm{O}_{2} \rightarrow 4 \mathrm{NO}+6 \mathrm{H}_{2} \mathrm{O}$

(ii)

$\displaystyle \mathrm{H}_{2} \mathrm{O}+\mathrm{F}_{2} \rightarrow \mathrm{HF}+\mathrm{HOF}$

(iii)

$\displaystyle \mathrm{Fe}_{2} \mathrm{O}_{3}+3 \mathrm{CO} \rightarrow 2 \mathrm{Fe}+3 \mathrm{CO}_{2}$

(iv)

$\displaystyle 2 \mathrm{H}_{2}+\mathrm{O}_{2} \rightarrow 2 \mathrm{H}_{2} \mathrm{O}$

(b)

Define a redox reaction in terms of gain or loss of oxygen.