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How many forms of sulfur exist in the atmosphere?

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How many forms of sulfur exist in the atmosphere?

(a) 1

(b) 2

(c) 3

(d) 4

This question was addressed to me in exam.

I'm obligated to ask this question of Environmental Aspects of Power Generation topic in chapter Steam Generators & Accessories of Energy Engineering

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Best answer
Right answer is (c) 3

Explanation: Sulfur in the atmosphere exists in three (3) forms:

i. Sulfur dioxide, SO2 which comes from artificial causes.

ii. Hydrogen sulfide, H2S which comes from natural causes.

iii. Various sulfates, coming from sea spray and oxidation of SO2.

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