Question

coal and gas for example​

Answer 1

coal

bituminous coal

linlgnite

coke

charcoal

Answer 2

Answer:

It is produced when coal is heated strongly in the absence of air. ... Coal gas contains a variety of calorific gases including hydrogen, carbon monoxide, methane, ethylene and volatile hydrocarbons together with small quantities of non-calorific gases such as carbon dioxide and nitrogen.

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