Black gun powder made of -a) Potassium nitrateb) Charcoalc) Sulfur powderd) Cellulose nitratee) Barium sulfate: (A) ab, (B) abc, (C) acd, (D) bcd
Answer is B. The classical gun powder is known as black powder, consists of charcoal (15%), sulphur (10%), and potassium nitrate (75%).