Which of the following will not conduct an electrical current?
a. pure water
b. tap water
c. aquarium water
d. ocean water

a. pure water

Explanation:

In liquid solutions the current is conducted by free ions present in the solution.

So here we know that all of the following condition the free ions are present in it.

1) Tap water

2) Aquarium Water

3) Ocean Water

All of them has free ions as impurity in it due to which current will flow in it while if water is in pure state then in that case the ions are not present in it to conduct the electricity

So here correct answer would be

a. pure water

current flows in a wire