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NEET 2026
Exam
NEET
Year
2026
Subject
Chemistry
Chapter
Electrochemistry

NEET 2026 · Chemistry · Electrochemistry

A solution of copper sulphate is electrolysed for 10 minutes with a...

A solution of copper sulphate is electrolysed for 1010 minutes with a current of 1.51.5 amperes. The mass of copper deposited at cathode is :
(Given : Molar mass of Cu=63\text{Cu} = 63 g mol−1^{-1}; 11 F =96487= 96487 C mol−1^{-1})

Options

  1. A1.70181.7018 g
  2. B0.29380.2938 g
  3. C2.40362.4036 g
  4. D0.58760.5876 g

Correct answer

B. 0.29380.2938 g

Step-by-step solution

The reaction at the cathode is Cu2++2e−→Cu\text{Cu}^{2+} + 2\text{e}^{-} \rightarrow \text{Cu}.

The quantity of charge QQ passed through the solution is given by Q=I×tQ = I \times t.

Substituting the given values:
Q=1.5 A×(10×60) s=900 CQ = 1.5 \text{ A} \times (10 \times 60) \text{ s} = 900 \text{ C}

From Faraday's first law of electrolysis, the mass of copper deposited is:
m=M×Qn×Fm = \dfrac{M \times Q}{n \times F}

Here, M=63 g mol−1M = 63 \text{ g mol}^{-1}, n=2n = 2, and F=96487 C mol−1F = 96487 \text{ C mol}^{-1}.

m=63×9002×96487m = \dfrac{63 \times 900}{2 \times 96487}

m=56700192974≈0.2938 gm = \dfrac{56700}{192974} \approx 0.2938 \text{ g}

Answer: 0.29380.2938 g
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