Physics 2017 JAMB Past Questions - Question 40: A charge of one coulomb liberates 0.0033g of copper in an electrolytic process. How long will it take a current of 2A to liberate 1.98g of copper in such a process?

Correct Answer

B

Explanation

To find the time it takes to liberate 1.98g of copper using a current of 2A, we can use the relationship between charge, current, and time.

First, let's calculate the charge required to liberate 1.98g of copper. We know that 1 coulomb liberates 0.0033g of copper. Therefore, the charge required to liberate 1.98g of copper can be calculated as follows:

Charge = (1.98g) / (0.0033g/Coulomb)
Charge = 600 Coulombs

Now, we can use the formula Q = I * t, where Q is the charge, I is the current, and t is the time. Rearranging the formula, we have:

t = Q / I
t = 600 Coulombs / 2 Amperes
t = 300 seconds

Therefore, it will take 300 seconds (or 5 minutes) for a current of 2A to liberate 1.98g of copper in the electrolytic process.