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0:00 When coal burns in sufficient amount of air then
0:43 The first oil well was drilled in
1:07 Inexhaustible natural resources in nature are
2:04 The slow process of conversion of dead vegetation into coal is called
3:07 Due to its great commercial importance, petroleum is also
3:27 is a mixture of about 200 substances.
3:40 Naphthalene balls used to repel moths and other insects are also obtained from .............
4:03 gas is obtained during the processing of coal to get coke.
4:24 Coal gas was used for street
4:49 Petrol and diesel are obtained
5:05 Petra and oleum refers to ........
5:31 Burning of fuels is a major cause of
5:45 Constituents of petroleum are....
6:27 Many useful substances are obtained
6:41 Various materials which are obtained from nature are called natural resources. Which of the following is not a natural resource?
7:32 Which of the following is a pair of exhaustible natural resources.
8:27 Coal is processed in industries to get some useful products. Which of the following is not obtained from coal?
8:56 Exhaustible natural resources are
9:27 Fossil fuels are obtained from
9:57 Coal is formed from the remains of
10:22 Which substance is formed by the carbonisation of dead vegetation?
11:23 Which of the following is not a constituent of petroleum?
11:47 Choose the correct statement from the following
13:58 31 a. Least polluting fuel for vehicle is ENG
16:31 TRUE / FALSE
17:03 (d) Coal tar is a mixture of various substances.