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Subject :NSO    Class : Class 8

Read the following statements carefully.
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.

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