Question

4.1. 4.2. Oxides of sulphur and nitrogen are carried to the ground by three main mechanisms. Briefly explain the three mechanisms. (6) The atmosphere is divided into different layers, each with a different function. The stratosphere contains the ozone (O3). a) At what distance from earth is the so-called "ozone layer"? (2) b) What is the function of the ozone layer? (2) c) What is responsible for the depletion of the ozone layer? (2) d) What are the various industrial processes are responsible for the depletion of the ozone layer? (2) Calculate the annual rate of emission of SO2 from a coal sample having 11.5% sulphur. The coal is burnt at a rate of 650 g/s. (6) 4.3.

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Answer 1

4.1) 3 main methods can be acid rain ,direct water pollution and air pollution

In acid rain the pollutants of oxides direct react with water in atmosphere and come down to the ground

Water pollution---- direct oxides of sulpher and nitrogen is released with the water in the ground

Air pollution ---- particles of oxides of sulpher and nitrogen come down to earth and settles on the ground it self after forming clusters of such particles

4.2)ozone layer is 15-30 km above the ground

Ozone layer protect us from cancerous ultraviolet rays of sun

The depletion is caused by excess air pollution in the atmosphere

Any industrial activities which releases pollutants in atmosphere in the air is responsible for this.

4.3)

5+02 So2 650g wal- 4 650(0,115) L65 gly Mollis 74.75 glo Moles of S - 74 75 74.75 -2.34 Mills 32 of so, Produad 2.34 Molly (2.34 (360o) (24) mall, 2.39(3400) (20) Molday » (2.34)(3600) (24)(365) Mol/year 73666125 mol/year. I Mole SO₂ 64 g or 0.064 kg > 4714632 kg / year Is Released kg

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