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Q.

Burning of coal in the air is a?


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a

Physical change

b

Chemical change

c

Reversible change

d

Endothermic reaction 

answer is B.

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Detailed Solution

Burning of coal in air is a permanent reaction means it is an irreversible reaction, it cannot be reversed. So, it is a chemical change.
Coal (hydrocarbons) → CO2 + H2O.
 
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Burning of coal in the air is a?