Which of the following statements is not true about destructive distillation of coal?
A It is carried out by heating coal strongly to 1000°C in the absence
of air.
B The residue left behind after the process is a good fuel and burns
without smoke.
C The gas evolved during the process is used as a fuel in many industries situated near the coal processing plants.
D None of these.
Coal gas doesn't have many uses in present times. However, coal gas was used as a fuel earlier and also used to light street lamps in London. Thus, Option C ought to be the correct answer, but I would be grateful if the solution to the question was provided.