Question

Assertion :A current of $96.5$ amperes is passes into aquesous $AgNO$${}_3$ solution for $100$ seconds.
The weight of silver deposited is $10.8g$ (At.wt. of $Ag=108$). Reason: The mass of a substance deposited during the electorlysis of an electrolyte is inversely propotional to the quantity of elctricity passing through the electrolyute.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Assertion is incorrect but Reason is correct

Answer 1

The correct option is C Assertion is correct but Reason is incorrect

$96.5amp\times 100Sec=9650C$
$96500C=1\text{mole of electron}$
$\therefore 9650C=\text{0.1 mole of electron}$
$A{g}^{+}+e^{-}\to Ag$
1 mole of $e^{-}$ reduces 1 mole of Ag
$\therefore$ 0.1 mole of $e^{-}reduces=\frac{1\times 0.1}{1}=0.1\text{mole of Ag}$
$\therefore \text{mass of Ag reduced}=0.1\times 108=10.8g$
$\text{Mass of substance}=ZIt$
$\therefore$ Mass of substance $\alpha$ Current
$\therefore$ Assertion is true but reason in false.