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Railways PYQCBT 1 2016

RRB NTPC · Question 39

Gunpowder mainly contains A. Calcium sulfate B. Potassium nitrate C. Lead sulphide D. Zinc sulphide

  1. A

  2. D

  3. B

  4. C

Show answer & explanation

Answer: (C) B

Explanation

Gunpowder (black powder) is a mixture of about 75% potassium nitrate (saltpetre), 15% charcoal and 10% sulphur. The potassium nitrate supplies the oxygen that makes it burn rapidly.