Q. Which of the following is used to provide smoke screens :
A) Calcium phosphide
B) Zinc sulphate
C) Sodium carbonate
D) Zinc phosphide
Explanation
(a)
Calcium phosphide reacts with moisture to give $PH_{3} \bullet PH_{3}$ reacts with $O_{2}$ to give white dense for of $P_{2}O_{5}.$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.