Coal produces heat energy when burnt so it can be used as a good fuel to cook food.
b) Carbon dioxide
Coal is a form of carbon so when it burns in air, it reacts with oxygen to form carbon dioxide gas.
c) liquid, unpleasant
Coal tar is one of the products of coal which is a black, thick fluid having unpleasant smell which is used for metalling roads.
d) Coal, natural gas
They are fossil fuels as they are obtained from dead remains of plants, animals.
They are present in limited quantity in nature and can be exhausted by human activities.
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