Question

In photochemical smog, ________ is an example of a primary pollutant, while _________ is an example of a secondary pollutant.

[Write out the names of the substances; do not use chemical formulae]

Due to sunlight being ________ (less/more) intense on a cloudy day than a sunny day, ozone levels on a cloudy day are _______ (lower/higher) than on a sunny day.

Specific sources of hydrocarbons in polluted cities are ______ and   (b) ______

In rural areas, a natural source of NO_X is ________ .

["Industry(s)" and "factory(s)" are not specific enough sources; they are unacceptable in any of these blanks.]

Answer 1

SOLUTION:-

1. Ans:- Primary pollutant : Nitrogen oxides.

Secondary pollutant: Ozone.

EXPLANATION:- Nitrogen oxides comes from the vehicles and that's why it is more visible in most populated urban areas. The nitrogen oxides enters into the atmosphere and reacts with the sun light and produce molecular oxygen which further mixed with oxygen atom and produce 0zone.

On the other hand, nitrogen oxides mix with water and produce nitric acid.

So, primary pollutant is nitrogen oxides and secondary pollutants are ozone, nitric acid, aldehydes, PANs. Those pollutants are floated in atmosphere and mixed with each other and produce photochemical smog in city in morning and afternoon time.