Match the following:
| a. Coal gas | 1. It is a tough and black solid substance that is obtained by heating coal in the absence of air. |
| b. Coal tar | 2. It is a thick, black liquid having an unpleasant smell that is obtained by heating coal in the absence of air. |
| c. Coke | 3. It is a gaseous fuel that is obtained by the strong heating of coal in the absence of air. |
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