Question

30. A brief information about substances X, Y and Z is
given here.
X: A gaseous fuel obtained by the strong heating of
coal in the absence of air.
Y: A thick black liquid having an unpleasant smell
obtained by heating coal in the absence of air.
Z: A tough and porous black solid prepared by heating
coal in the absence of air.
Which of the following statements is incorrect about
X, Y and Z?
A. X is a mixture of methane, hydrogen, carbon
monoxide and some other gases.
B. Y is a mixture of about 200 substances which can
be separated by simple distillation.
C. Z contains almost 98 percent carbon.
D Nowadays X is used as a source of heat while
for lichting purposes​

Answer 1

Answer:

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