Question

Which of the following will behave as the best reducing agent? Given \[ \text{Al}^{3+} + 3e^- \rightarrow \text{Al} \quad E^\circ = -1.66 \, \text{V} \] \[ \text{Co}^{3+} + e^- \rightarrow \text{Co}^{2+} \quad E^\circ = 1.81 \, \text{V} \] \[ \text{Fe}^{3+} + e^- \rightarrow \text{Fe}^{2+} \quad E^\circ = 0.77 \, \text{V} \] \[ \text{Cd}^{2+} + 2e^- \rightarrow \text{Cd} \quad E^\circ = -0.4 \, \text{V} \]

• A. Al
• B. Co\(^{2+}\)
• C. Fe\(^{2+}\)
• D. Cd

Hint:

The best reducing agent has the most negative reduction potential.

Answer 1

The Correct Option is A

Step 1: Understand the concept of a reducing agent.
A reducing agent is a substance that donates electrons. The best reducing agent is the one with the most negative \( E^\circ \) value, as it readily loses electrons. Step 2: Compare the \( E^\circ \) values.
The most negative \( E^\circ \) is for Al, which is -1.66 V. This makes Al the best reducing agent. Final Answer: \[ \boxed{\text{Al}}. \]