SCIENCE...
a gas escapes through the delivery tube from the test tube B. On ignition the gas _ .this shows that the gas liberated is coal gas.
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hey mate
Explanation:
a) coal gas
In destructive distillation of coal, finely powdered coal taken in a test tube is heated. Coal tar gets collected at the bottom of the second test tube and coal gas escapes out through the side tube. The black residue left in the first tube is called coke.
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