Observe the figure of destructive distillation of coal.

Now, select the incorrect statement regarding X, Y and Z.

Options

A. Z is a pure form of carbon and is used as a red ucing agent in the extraction of metals.
B. Xis used as a fuel in industries.
C. Y is tough and porous and is used in the manufacture of producer gas and water gas.
D. None of these

Answer

C

Explanation

In destructive distillation of coal, finely powdered coal taken in a test tube is heated. Coal tar ( Y) gets collected at the bottom of the second test tube which is a thick, black liquid and coal gas (X) escapes out through the side tube. The black residue left in the first tube is called coke (Z).