Electrochemistry - Result Question 98
46. A $100$ watt, $110$ V incandecent lamp is connected in series with an electrolyte cell containing cadmium sulphate solution. What weight of cadmium will be deposited by the current flowing for $10$ h?
$(1987,5 M)$
Show Answer
Answer:
Correct Answer: 46. $(19.1)$ g
Solution:
$100$ W lamp will produce $100$ J/s.
$\Rightarrow 100 J=110 \times C \Rightarrow C=\frac{10}{11}$ Coulombs
Therefore, total Coulomb passed in 10 h
$ =\frac{10}{11} \times 10 \times 60 \times 60=32727.27 $ $C $
Number of gram equivalent of $Cd^{2+}$ deposited
$ =\frac{32727.27}{96500}=0.34 $
Weight of $Cd$ deposited $=0.34 \times \frac{112.4}{2} g=19.1 g$
BETA
