Question

The weight of silver $\text{(atomic wt.}=108)$ displaced by a quantity of electricity which displaces $5600mLof{O}_2$ at STP will be : -
(AIPMT-2014

• A. $54.0g$
• B. $10.8g$
• C. $108g$
• D. $5.4g$

Answer 1

The correct option is C $108g$

According to Faraday's $2^{nd}$ law $\frac{w_{Ag}}{E_{Ag}}=\frac{w_{O_2}}{E_{O_2}}$ Weight of $O_2=n_{O_2}\times M_{O_2}$ Weight of $O_2=\frac{5600}{22400}\times 32$ Volume of $O_2$ at STP=22400mL $\frac{w_{Ag}}{108}=\frac{\left(\frac{5600}{22400}\right)\times 32}{8}$ $\therefore w_{Ag}=108g$