Question
Which of the following is a redox reaction?
A.
Reaction of $${H_2}S{O_4}$$ with $$NaOH$$
B.
In atmosphere, formation of $${O_3}$$ from $${O_2}$$ by lightening
C.
Formation of oxides of nitrogen from nitrogen and oxygen by lightening
D.
Evaporation of $${H_2}O$$
Answer :
Formation of oxides of nitrogen from nitrogen and oxygen by lightening
Solution :
(A) Neutralisation reaction
(B) $$3{O_2} \to 2{O_3},$$ allotropic formation
(C) $${N_2} + {O_2} \to 2NO$$
$${N_2}$$ is reduced and $${O_2}$$ is oxidised.
(D) In evaporation of $${H_2}O,$$ state changes only.