Q. What is the volume of “20 volume$\ H_{2}O_{2}$” required to get $5000\ cm^{3}$ of oxygen at STP?
A) $250\ cm^{3}$
B) $20\ cm^{3}$
C) $100\ cm^{3}$
D) $125\ cm^{3}$
Explanation
(a)
‘20 volume $H_{2}O_{2}$’ means that 1mL of this $H_{2}O_{2}$ gives 20mL oxygen on decomposition at STP.
Hence, $5000\ {cm}^{3}\ O_{2}$ will be obtained by $= \frac{5000}{20}$
$\ \ \ \ \ \ \ = 250\ {cm}^{3}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.