Question 29
ElectrolysisWhen a current I was passed through an electrolyte solution for 40 minutes, a mass X g of a univalent metal was deposited at the cathode. What mass of the metal will be deposited when a current 2I is passed through the solution for 10 minutes?
- A.X/4 g
- B.X/2 g
- C.2X g
- D.4X g.
Show the answer and explanation
Answer: B (X/2 g)
Explanation
Mass deposited is proportional to charge = current × time. First: I × 40 = 40I. Second: 2I × 10 = 20I, which is half, so the mass is X/2 g.