PYQ NEET- Electrochemistry L-5

Question: How many grams of cobalt metal will be deposited when a solution of cobalt(II) chloride is electrolyzed with a current of 10 amperes for 109 minutes? (1 Faraday $=96,500 \mathrm{C}$; Atomic mass of $\mathrm{Co}=59 \mathrm{u}$ )#

A) 4.0

B) 20.0

C) 40.0

D) 0.66

Answer: 20.0#

Sol:#

$\begin{gathered} w=\frac{I t E}{96500} \ =\frac{10 \times 109 \times 60 \times 59}{96500 \times 2}=19.99 \approx 20 \mathrm{~g} \end{gathered}$