Question

How long would it take to electroplate a spoon with 0.1 mol of silver (108 g/mol) at a constant current of 2.0 A using AgNO₃?

विकल्प

• 80.4 minutes

• 482.5 minutes

• 965 minutes

• 134 minutes

Answer 1

80.4 minutes

Explanation:

At cathode: \[\ce{Ag^+ + e^- -> Ag}\]

∴ 1 F (i.e., 96500 C) of electricity is required to produce 1 mol of Ag.

∴ 0.1 F (i.e., 0.1 × 96500 C) of electricity will be required to produce 0.1 mol of Ag.

Now, Q = I × t

∴ 0.1 × 96500 = 2.0 × t

∴ t = 4825 seconds = 80.4 minutes