Most of the copper used to make wire has been electrically refined by depositing it from copper salts solution (divalent) on to a cathode. What is the cost of electrical energy required per kg of copp

Question

Most of the copper used to make wire has been electrically refined by depositing it from copper salts solution (divalent) on to a cathode. What is the cost of electrical energy required per kg of copper if the cost of electricity is Rs 4.00 per kWh and the cell operates at 0.33 V? The electrochemical equivalent of copper is 0.00033 g/coulomb.

Prashant Kotian · Accepted Answer

Correct answer: D. Electrochemical equivalent (Z) = 0.00033 g/C. Mass to deposit = 1 kg = 1000 g. Total charge Q = Mass / Z = 1000 / 0.00033 = 3.03 × 10^6 C. Energy (in Joules) = Q × V = 3.03 × 10^6 × 0.33 = 10^6 J. Convert to kWh: 10^6 J / (3.6 × 10^6 J/kWh) = 1/3.6 kWh. Total cost = (1/3.6) × 4.00 = 4 / 3.6 = 1.11 Rs. Therefore, correct answer is D.

💡 Solution & Explanation

Practice 22,000+ questions like this