Multiple choice

Coal gas is used in _________.

  1. illumination

  2. disinfection

  3. deep freezing

  4. chemical preservation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Coal gas, also known as town gas, was historically used primarily for illumination (lighting) in homes and street lamps before the widespread adoption of electricity. Option A correctly identifies this historical use. Disinfection (B) requires different gases. Deep freezing (C) uses refrigerants. Chemical preservation (D) is not a primary application of coal gas. The illuminating property of coal gas made it valuable for lighting applications.

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