Multiple choice

The residue left after burning wood in a limited supply of oxygen is called

  1. coal tar

  2. ash

  3. charcoal

  4. coal

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Huge amount of wood is required to produce charcoal for commercial and domestic purposes. So, the residue left after burning wood in a limited supply of oxygen is called charcoal. Hence, option (3) is correct.