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Harmful trace metals in fly ash

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Environmental Science
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Harmful trace metals in fly ash:

Answer & Solution
Correct Answer: Option D
Depending upon the source and composition of the coal being burned, the components of fly ash vary considerably, but all fly ash includes substantial amounts of silicon dioxide (SiO2) (both amorphous and crystalline), aluminium oxide (Al2O3) and calcium oxide (CaO), the main mineral compounds in coal-bearing rock strata.
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