Question

As per standard reduction potential values, which is the strongest reducing agent among the given elements?

• A. Rb
• B. Sr
• C. Na
• D. Mg

Hint:

To identify the strongest reducing agent, remember that the element with the most negative standard reduction potential is the best electron donor, hence the strongest reducing agent.

Answer 1

The Correct Option is A

The strongest reducing agent is the one with the most negative reduction potential. In general, a reducing agent is a substance that donates electrons, and the strength of a reducing agent is inversely related to its reduction potential.
Here are the standard reduction potentials for the given elements:
- \( Rb \): \( -2.93 \, {V} \)
- \( Sr \): \( -2.89 \, {V} \)
- \( Na \): \( -2.71 \, {V} \)
- \( Mg \): \( -2.37 \, {V} \)
The element with the most negative reduction potential is \( Rb \), indicating that it is the strongest reducing agent among the given options.
Thus, the correct answer is \( Rb \).

Answer 2

To determine the strongest reducing agent among the given elements, we should consider the standard reduction potential (E°) values. In general, a more negative E° value indicates a stronger reducing agent. The standard reduction potentials for the elements involved are given as follows:

• Rb: -2.92 V
• Sr: -2.89 V
• Na: -2.71 V
• Mg: -2.37 V

The standard reduction potential helps predict the tendency of a substance to gain electrons. A negative value signifies a strong inclination to donate electrons, making it a powerful reducing agent. Among the elements:

• Rubidium (Rb) has the most negative reduction potential, -2.92 V, indicating it is the strongest reducing agent.

Therefore, based on the standard reduction potential values, Rb is the strongest reducing agent among the options.