Q. $x$ g of Ag is deposited by passing 4 A of current of for 1 h. How many gram of Ag will be deposited by passing 6 A for 40 min?
A) $2x\ g$
B) $4x\ g$
C) $x\ g$
D) $5x\ g$
Explanation
(c) According to Faraday’s first law of electrolysis, mass deposited
$\ \ \ \ \ \ m = ZIt$
Where $Z =$ electrochemical equivalent of substance
$\therefore\ \frac{m_{1}}{m_{2}} = \frac{I_{1}}{I_{2}} \times \frac{t_{1}}{t_{2}}\ $
Or $\frac{xg}{m_{2}} = \frac{4A}{6A} \times \frac{60\ min}{40\ min}\ or\ m^{2} = xg$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.