Monday, 8 July 2013

Carbonisation of coal is the process of _______.

(a)    pulverising coal in inert atmosphere
(b)    heating wood in a limited supply of air at temperatures below 300°C
(c)    strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel
(d)    binding the pulverised coal into brickettes
(e)    enriching carbon in the coal.

Ans: c

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