Question

burning of coal is initiated by spark and is example of spontaneous reactions because
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Answer 1

Answer:

smoke

Explanation:

smoke produce energy energy to us and they they are very harmful for our environment

Answer 2

Answer:

It is a slow process and the heat evolved is carried away by air. This process of self-heating of coal or other carbonaceous material resulting eventually in its ignition is termed as “spontaneous heating” or “auto oxidation”. Coal can interact with oxygen in the air at ambient temperature liberating heat.