Electrolysis Practice Exam

Electrolysis is primarily accomplished by which type of current?

1. Alternating current

2. Direct current

3. Pulsating current

4. Static current

The correct answer is: Direct current

Electrolysis is predominantly accomplished using direct current (DC). This is because direct current flows in a single direction, providing a consistent power source that allows for the continuous movement of ions toward the electrodes. During the electrolysis process, the positive ions migrate towards the negatively charged cathode, while negative ions move towards the positively charged anode. This directional current is critical to effectively separating elements or compounds in solutions during the process. Alternating current (AC) alternates direction, which would prevent the stable movement of ions necessary for electrolysis to occur properly. Pulsating current, while it might involve some directionality, does not provide the steady flow required for effective ion separation. Static current, by definition, does not flow and therefore cannot facilitate electrolysis at all. Overall, the use of direct current is essential for achieving the desired reactions in electrolysis, making it the correct choice for this question.