Question

What is the time required for the formation of young brown coals?

(a) 10^7 years

(b) 3×10^8 years

(c) 3×10^9 years

(d) 10^10 years

I had been asked this question in an internship interview.

I want to ask this question from Coal in chapter Fuels and Combustion of Engineering Chemistry II

Answer 1

The correct option is (a) 10^7 years

For explanation: For the formation of matured coals (bituminous and anthracite) 3×10^8 years are required where as for the young brown coal (peat and lignite) 10^7 years are required. The temperature for the formation of coal is greater than 300^o.