1.write balanced equation for the following

a] burning of coal in sufficient supply of air

b] burning of coal in insufficient supply of air

Name the type of reaction in both the cases and give reason why the

Carbon is the main component of coal. 

If coal burns in sufficient amount of oxygen, it burns to produce carbon dioxide and water vapours.

C + O2 → CO2 + Heat
A large amount of heat is released in this process hence it is an exothermic reaction.

If there is insufficient amount of oxygen , then carbon monoxide will be formed.

2C + O2 → 2CO 
The amount of heat released is very less so it can simply considered as combination reaction.

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second reaction is more dangourous

2]Is combustion of coal an endothermic or exothermic process?


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combustion of coal is an exothermic reaction as when the coal burns it releases a lot of heat.

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