Consider the following statements about FLY ASH a waste generated in coal based thermal power plants...........

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Consider the following statements about FLY ASH, a waste generated in coal based thermal power plants:

1. Fly ash can be used to correct the soil Ph.

2. Fly ash is a much safer alternative to the chemical fertilizers.

3. Fly ash contains an optimum mix of both organic and inorganic nutrients required for crops.

4. Application of fly ash to acidic soil can reduce green house gases emissions.

Which of the above statements are correct?

1, 3 and 4

1 and 4

1 and 2

2 and 3

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Explanation:

2nd and 3rd statements are incorrect.
Fly ash is a byproduct from burning pulverized coal in electric power generating plants. During combustion, mineral impurities in the coal (clay, feldspar, quartz, and shale) fuse in suspension and float out of the combustion chamber with the exhaust gases. As the fused material rises, it cools and solidifies into spherical glassy particles called fly ash. Fly ash is collected from the exhaust gases by electrostatic precipitators or bag filters.