(a) ____ is a blackish solid fossil fuel that occurs inside the Earth. (b) Petroleum extracted from Earth is called _____ (c) ____ is a source of several chemicals and dyes. Select the correct option to complete the given statements.
(a) What happens when carbon burns in air? Write the chemical equation of the reaction which takes place. (b) Why are coal and petroleum called fossil fuels? (c) Explain how coal was formed in the earth. (d) Describe how petroleum was formed in the earth. (e) Name a fossil fuel other than coal and petroleum.
Question 12 Choose the correct statement. (a) Sun can be taken as an inexhaustible source of energy (b) There is infinite storage of fossil fuel inside the earth (c) Hydro and wind energy plants are non polluting sources of energy (d) Waste from a nuclear power plant can be easily disposed off