The burning of coal in the absence of air or in limited supply of air under high pressure and temperature. By the process of carbonization coal is formed under the earth. The simplest example is that when you dump the piece of wood in the garbage of waste of animals after 15 to 20 days it starts converting in coal like formation. It is a destructive distillation process.
When an acid react with metals then in the result respective salt of metal formed and hydrogen gas is released. Following is the example Mg + H2SO4 ------------> MgSO4 + H2 During this reaction energy is released so it is a exothermic reaction.
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