Question

b
OK
d
Coal and petroleum are formed as a result of -
1. Physical process
ii.
Chemical process
it. Artificial process
iv. Condensation
It is very clean fuel which causes no pollution on burning-
1 LPG
CNG
ill. Methane
iv.
Coal
Anthracite, Bituminous, Lignite and Peat are-
1. Vanaspati oil
Il Coal
ill. Lubricating oll
| iv. Petroleum
It is a mixture of solid, liquid and gaseous hydrocarbons mixed with water, salt
and earthly particles-
1. Coal
Petroleum
1. Natural gas
1 iv. Metals​

Answer 1

Explanation:

Chemical

CNG

Coal

Metals

Answer 2

Answer:

a- artificial process

b - cng

c - coal

d - petroleum