Fill in the following blanks with suitable words:
(a) Fossil fuels are………...and…….
(b) Coal contains mainly…………...
(c) The slow process of conversion of dead vegetation into coal is called……………
(d) The process of separation of different constituents from petroleum is called……………...
(e) The least polluting fuel for vehicles is…….
(f) The burning of fossil fuels causes air………….and also leads to global…………...
The substances W is a fossil fuel. It occurs deep below the ground in certain areas of the earth. Another fossil fuel X is found trapped above the deposits of W. when W is subjected to a process called Y, then a number of different products are collected at different temperature ranges which are put to different uses. A special grade of product z obtained in this way is used an aviation fuel in jet aero planes.
(a) What are (i) W, and (ii) X
(b) what is the physical state of (i) W, and (ii) X?
(c) Name the process Y?
(d) Name the product Z?
The material A is fossil fuel which is extracted from the earth. It is said to be formed from the buried, large land plants by a very slow process B. when A is heated in the absence of air in a process called C, then it gives three products D, E and F. The product D is used as a reducing agent in the extraction of metals, the product E is used as an industrial fuel whereas the product F has been traditionally used for metallic the roads.
(a) What could material A be?
(b) What is (i) physical state, and (ii) colour, of A?
(c) Name the processes (i) B, and (ii) C.
(d) What are (i) D, (ii) E, and (iii) F?
The fossil fuel P is formed under the earth by the decomposition of vegetable matter lying under water by the action of anaerobic bacteria. The major component of fuel P is Q. The fossil fuel P is used as a source of gas R needed to manufacture nitrogenous fertilizers. When P is filled in metal cylinders and used as a fuel in motor vehicles, it is called S. What are P, Q, R and S?