[IMP]Fly ash

Question 1

PYQ

Answer 1

With reference to ' fly ash' produced by
the power plants using coal as fuel,
which of the following statements is/are
correct?
1) Fly ash can be used in the production of
bricks for building construction.
2) Fly ash can be used as a replacement for
some of the Portland cement contents of
concrete.
3) Fly ash is made up of silicon dioxide and
calcium oxide only, and does not contain
any toxic elements.

Ans : 1 & 3 correct

Question 2

what is it?

Answer 2

• contains heavy metals from coal, a large amount of PM 2.5 and black carbon (BC).
• It is end product of combustion during the process of power generation in the coal based thermal power plants
• by product of burning coal
• has good structural qualities
• contains heavy metals,volatile organic compounds,& radioactive solids
• not considered hazardous currently

Question 3

about

Answer 3

• It can get transported to a radius of 10 to 20 kms.

- can settle on water and other surfaces

Question 4

applications

Answer 4

-construction industries : manufacturing of Portland Cement, bricks/blocks/tiles manufacturing, road embankment construction and low-lying area development, etc.

Question 5

PYQ

Answer 5

(Pre’20-SetB) Q.99. Consider the following statements :

Coal ash contains arsenic, lead and mercury.
Coal-fired power plants release sulphur dioxide and oxides of nitrogen into the environment.
High ash content is observed in Indian coal.

-all correct