| X: It is a fossil fuel used in thermal power plants to produce electricity. |
| Y: It is a porous, black and almost pure form of carbon. |
| Z: It is a mixture of about 200 substances. X, Y and Z are respectively |
A) Petroleum, coal gas, coke
B) Coal, coke, coal tar
C) CNG, bitumen, diesel
D) Coal gas, petrol, paraffin wax.
Correct Answer: B
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