What happens when coal is heated in the absence of air? Name this process. Write the name of the two products obtained during this process.
When coal is heated in the absence of air, it breaks up and provides a large number of organic compounds and some inorganic compounds.The process is known as destructive distillation of coal.
In this process coal tar and coal gas can obtained.
What are inexhaustible natural resources ? Explain with the help of example.
The material A is a fossil fuel which is expected 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 against in the extraction of metals, the product E is used as an industrial fuel whereas the product F has been traditionally used for metalling 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 ?
Where is natural gas usually found ? Name the combustible gas present in natural gas.
The substance 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 as aviation fuel in jet aeroplanes.
(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.
