Q. Air contains $20\% O_{2}$ by volume. How much volume of air will be required for 100 cc of acetylene?
A) 500 cc
B) 1064 cc
C) 212.8 cc
D) 1250 cc
Explanation
(d)
$2C_{2}H_{2} + 5O_{2} \rightarrow 4CO_{2} + 2H_{2}O$
2 cc 5 cc
100 cc 250 cc
Hence, air will be needed $= \frac{100}{20} \times 250$
=$1250$ cc
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.