How can we burn coal in the absence of oxygen ?

Burning of coal occurs in presence of oxygen. The coal is heated in the absence of air which is known as destructive distillation of coal. This process result in the formation of by-products such as : coal gas, ammonia, coal tar and coke.

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Actually we don't burn it but we heat it in the absence of air, therefore it's a completely different process. heat coal in the absence of air give coke
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We can't burn anything without oxygen
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in the process of carbonisation
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