Question

Coal is a solid fuel which is mainly composed of carbon, it also contains
hydrogen, sulphur, oxygen and nitrogen. It is a fossil fuel. It is burnt for getting
heat and energy. About two third of the presently rnined coal is burnt in power
stations to make electricity. Burning of coal contributes to many environmental
and health issues. China is the largest producer and consumer of coal in the
world. Coal however, is available only in a limited quantity. Hence, we must
use it judiciously. We, must also increase our dependence on alternate sources
of energy
(a) How is coke obtained ?
(b) Write the S.I. unit of the calorific value of a fuel.
(c) Name any two varieties of coal that have been formed due to different
temperature and pressure conditions under the surface of the earth.
(d) Which gas produced by combustion of coal-
(i) results in formation of carboxy haemoglobin.
(ii) causes the green house effect.​

Answer 1

Answer:

This conversion of dead vegetation into coal is called coalification. Coalification starts with dead plant matter decaying into peat. Then over millions of years the heat and pressure of deep burial causes the loss of water, methane and carbon dioxide and an increase in the proportion of carbon.

Explanation: