Same chapter3 marksDifficulty: Medium
Calculate the emf of the cell Zn | Zn2+(1 M) || Cu2+(1 M) | Cu, given E° for Zn2+/Zn = −0.76 V and for Cu2+/Cu = +0.34 V.
Electrochemistry
3 marksDifficulty: Medium
Calculate the mass of copper deposited when a current of 2 A is passed through copper sulphate solution for 30 minutes. (Cu = 63.5, F = 96,500 C)
Original Khojo Papers practice question — not from a past board paper.
Answer
About 1.18 g
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
The charge passed is 2 × 1,800 = 3,600 C. Copper is deposited as Cu2+ + 2e− → Cu, so the equivalent mass is 63.5/2 = 31.75, and the mass is 31.75 × 3,600 ÷ 96,500 ≈ 1.18 g.
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