Single Choice

In a copper voltameter, mass deposited in 6 minutes is m gram. If the current-time graph for the voltameter is as shown here, then the E.C.E of the copper is

Am / 5
Bm / 500
Correct Answer
C5 m
Dm / 1800

Solution

It is known that $$m = zit $$ and $$ it $$ = Area of given curve
= Area of triangle + Area of rectangle
$$ \Rightarrow = \dfrac{1}{2} \times \left ( 2\times 60 \right )\times 1+\left ( 6-2 \right )\times 60\times 1= 300 $$
$$ \therefore Z = \dfrac{m}{it} = \dfrac{m}{300} $$

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