Q. Same amount of electric current is passed through solutions of ${AgNO}_{3}$ and HCl. If 1.08 g of silver is obtained in the first case, the amount of hydrogen liberated at STP in the second case is
A) ${224\ cm}^{3}$
B) 1.008 g
C) ${112\ cm}^{3}$
D) ${22400\ cm}^{3}$
Explanation
(c)
According to Faraday’s second law of electrolysis, we have
$\frac{w_{1}}{w_{2}} = \ \frac{E_{1}}{E_{2}}$
∴ $\frac{1.08}{x} = \ \frac{108}{1}\$
∴ Weight of hydrogen $(x)\ = \ 0.01\ g$
Hence, the volume of hydrogen at
$\ \ \ STP\ = \ \frac{22400\ \times 0.01}{2} = 112\ {cm}^{3}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.