Question

Which of the following is a redox reaction ?
A. Reaction of `H_(2)SO_(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 1

Correct Answer - C
(a) Neutralisation reaction
(b) `3O_(2)rarr 2O_(3)`, allotropic formation
(c) `N_(2)+O_(2)rarr 2NO`
`N_(2)` is reduced and `O_(2)` is oxidised.
(d) In evaporation of `H_(2)O`, state changes only.