Environmental chemistry

(A) Carbon monoxide – Haemoglobin
(B) Sulphur dioxide – Stiffness of flower buds
(C) Polychlorinated biphenyls – Carcinogenic
(D) Oxides of nitrogen – Metabolized by pyrus plants

Veronal is a barbiturate drug and it constitutes an important class of tranquilizers.

ln K = ln A – (E? /R) (1/T)
In ln K v/s 1/T graph
Slope = –E? /R
–5 * 10³ = –E? /8.314
E? = 5 * 10³ * 8.314
= 41500 J mol? ¹ or 41.5 kJ mol? ¹

Pollution due to oxides of sulphur gets enhanced due to hydrocarbons and oxidizing agents like O? & H? O?

Formation of photochemical smog, which is also known as oxidizing smog, takes place in the presence of sunlight and O?

Oxygen gas (O? ) is not considered a greenhouse gas.

Excess of nitrogen and phosphorus is primarily responsible for eutrophication and hence an indicator of polluted environment.

Burning of fossil fuels (which contain sulphur and nitrogenous matter) such as coal and oil in power stations and furnaces produce sulphur dioxide and nitrogen oxides which causes acid rain.

In presence of sunlight CFC's molecule divides & release chlorine free radical, which react with ozone give chlorine monoxide radical (CIO°) and oxygen.
CF? Cl? (g) → C (g) + C? Cl (g)
Cl° (g) + O? (g) → ClO° (g) + O? (g)
ClO° (g) + O (g) → Cl° (g) + O? (g)