Which of the following is responsible for conducting electric current in aqueous solutions?

• A. Electrons moving through the solution
• B. Ions
• C. Molecules of water
• D. Dissolved gases

Answer: (B)

Verified step by step guidance

1. Understand that electric current in aqueous solutions is carried by charged particles that can move freely through the solution.
2. Recall that electrons do not move freely through liquid water; instead, charged species called ions are responsible for conduction.
3. Recognize that molecules of water are neutral and do not carry charge, so they do not conduct electricity.
4. Note that dissolved gases are generally non-ionized and do not contribute to electrical conductivity.
5. Conclude that ions, which are charged atoms or molecules dissolved in water, are the species responsible for conducting electric current in aqueous solutions.