Multiple choice

When coal is heated in the absence of air, it produces coke, coal tar, amino acid liquor and coal gas. What will you call this process?

  1. Destructive distillation

  2. Distillation

  3. Refining

  4. Carbonisation

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A Correct answer
Explanation

The process of heating coal in the absence of air does not lead to the burning of coal, but forms many by-products. This process is called destructive distillation of coal. The main by-products of destructive distillation are: coke, coal tar, amino acid liquor and coal gas.