Consider the following: Silicon dioxide (SiO2) Calcium oxide (CaO) Aluminium oxide (Al2O3)How many of the above chemicals are primarily present in the fly ash?a)Only oneb)Only twoc)All threed)NoneCorrect answer is option 'C'. Can you explain this answer?

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UPSC Exam > UPSC Questions > Consider the following: Silicon dioxide (SiO2...

Consider the following:

Silicon dioxide (SiO₂)
Calcium oxide (CaO)
Aluminium oxide (Al₂O₃)

How many of the above chemicals are primarily present in the fly ash?

a)
Only one
b)
Only two
c)
All three
d)
None

Correct answer is option 'C'. Can you explain this answer?

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Consider the following: Silicon dioxide (SiO2) Calcium oxide (CaO) Alu...

Option (c) is correct Supplementary Notes Fly Ash Fly ash is the finely divided residue that results from the combustion of pulverized coal and is transported from the combustion chamber by exhaust gases. It is produced from the combustion of coal in electric utility or industrial boilers, produced by coalfi red electric and steam generating plants. It consists primarily of oxides of silicon, aluminium, iron, and calcium. Magnesium, potassium, sodium, titanium, and sulphur are also present to a lesser degree.

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Most Upvoted Answer

Consider the following: Silicon dioxide (SiO2) Calcium oxide (CaO) Alu...

Presence of Chemicals in Fly Ash
Fly ash, a byproduct of coal combustion, is composed of various chemical compounds. Among the chemicals listed - Silicon dioxide (SiO2), Calcium oxide (CaO), and Aluminium oxide (Al2O3), all three are primarily present in fly ash.

Explanation

Silicon Dioxide (SiO2)
- Silicon dioxide is a common component of fly ash, as it is present in coal in the form of impurities. During combustion, these impurities are concentrated in the fly ash.

Calcium Oxide (CaO)
- Calcium oxide is also found in fly ash, originating from the calcium carbonate present in coal. When coal is burned, calcium carbonate decomposes to form calcium oxide.

Aluminium Oxide (Al2O3)
- Aluminium oxide is another chemical compound that can be found in fly ash. It is derived from the aluminium content in coal, which is concentrated in the fly ash during combustion.
Therefore, all three chemicals - Silicon dioxide, Calcium oxide, and Aluminium oxide are primarily present in fly ash as they are inherent components of coal and its combustion byproducts. The presence of these chemicals in fly ash can have various environmental implications and applications in industries such as construction and agriculture.

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Consider the following: Silicon dioxide (SiO2) Calcium oxide (CaO) Aluminium oxide (Al2O3)How many of the above chemicals are primarily present in the fly ash?a)Only oneb)Only twoc)All threed)NoneCorrect answer is option 'C'. Can you explain this answer?

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