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NEET CHEMISTRYEasy

A steady current of 1.5 A flows through a copper voltmeter for 10 min. If the electrochemical equivalent of copper is 30×105 g C130 \times 10^{-5} \text{ g C}^{-1}, the mass of copper deposited on the electrode will be:

A

0.40 g

B

0.50 g

C

0.67 g

D

0.27 g

Step-by-Step Solution

According to Faraday's First Law of Electrolysis, the mass of a substance deposited at an electrode is given by the formula:

m=Z×Q=Z×I×tm = Z \times Q = Z \times I \times t

Where: Z=30×105 g C1Z = 30 \times 10^{-5} \text{ g C}^{-1} (electrochemical equivalent) I=1.5 AI = 1.5 \text{ A} (current) t=10 min=10×60 s=600 st = 10 \text{ min} = 10 \times 60 \text{ s} = 600 \text{ s} (time)

First, calculate the total charge (QQ): Q=I×t=1.5 A×600 s=900 CQ = I \times t = 1.5 \text{ A} \times 600 \text{ s} = 900 \text{ C}

Now, calculate the mass (mm) deposited: m=30×105 g C1×900 Cm = 30 \times 10^{-5} \text{ g C}^{-1} \times 900 \text{ C} m=27000×105 g=0.27 gm = 27000 \times 10^{-5} \text{ g} = 0.27 \text{ g}

Therefore, 0.27 g of copper is deposited on the electrode.

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