One common usage of coal is the production of coke. This occurs by
Oa.
heating coal to 1200C in the presence of air.
Ob. heating coal to 1200C in the absence of air.
Oc. heating coal to low temperatures in the presence of air.
Od. heating coal to low temperatures in the absence of air.

Coke production from coal involves heating pulverized bituminous coal to high temperatures in the absence of oxygen, resulting in essentially pure carbon known as coke. This process removes volatile components, leaving behind a solid, porous residue used as a fuel and reducing agent in smelting iron ore.

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One common usage of coal is the production of coke. This occurs byOa.heating coal to 1200C in the presence of air.Ob. heating coal to 1200C in the absence of air.Oc. heating coal to low temperatures in the presence of air.Od. heating coal to low temperatures in the absence of air.

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One common usage of coal is the production of coke. This occurs by
Oa.
heating coal to 1200C in the presence of air.
Ob. heating coal to 1200C in the absence of air.
Oc. heating coal to low temperatures in the presence of air.
Od. heating coal to low temperatures in the absence of air.