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Y is formed when X is heated in the absence of air. Y is a tough, porous, and black substance. Both X and Y are carbon-rich materials. What could X and Y be?

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Detailed Solution

When coal is heated in the absence of air, it undergoes a process called destructive distillation, which produces coke.

Coke is a tough, porous, and black substance that is used in the manufacturing of steel and other industrial processes. Both coal and coke are carbon-rich materials.

X is coal and Y is coke.

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