Question

2. Residue of burnt coal
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Answer 1

Answer:

Coal ash

Explanation:

Coal ash also known as coal combustion residuals (CCR's) is the mineral residue left after the burning of coal

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Answer 2

Coal ash

Coal ash is the mineralized residue left over from burning coal to generate electricity. It's actually a collection of different types of materials, called coal combustion products or coal combustion residuals: fly ash, flue gas desulfurization products, bottom ash, and boiler slag.