Question

The oxidation potentials of A and B are +2.37 V and +1.66 V respectively. In chemical reactions

• A. A will be replaced by B
• B. A will replace B
• C. A will not replace B
• D. A and B will not replace each other

Hint:

Key Exam Tip:
In displacement reactions, the more reactive element (or substance) displaces the less reactive element. Reactivity can be determined by:
• Oxidation Potential: A higher (more positive) oxidation potential means greater tendency to oxidize, hence higher reactivity.
• Reduction Potential: A lower (more negative) reduction potential means greater tendency to oxidize, hence higher reactivity. In this case, A has a higher oxidation potential than B, so A is more reactive.

Answer 1

The Correct Option is B

This question deals with the relative reactivity of two substances (A and B) based on their oxidation potentials. Oxidation potential is the tendency of a substance to lose electrons (undergo oxidation). A higher oxidation potential indicates a greater tendency to be oxidized, meaning the substance is more reactive. Given oxidation potentials: Oxidation potential of A = +2.37 V Oxidation potential of B = +1.66 V Comparing the oxidation potentials, we see that +2.37 V is greater than +1.66 V. This means that substance A has a higher tendency to be oxidized than substance B. Therefore, A is more reactive than B. In chemical reactions involving displacement, a more reactive substance can displace a less reactive substance from its compounds. Specifically, if A is more reactive than B, then A can displace B from its compounds. Let's analyze the options in this context:
• A will be replaced by B: This would happen if B were more reactive than A. Since A has a higher oxidation potential, it is more reactive, so this is incorrect.
• A will replace B: This will happen if A is more reactive than B. Since A has a higher oxidation potential (+2.37 V > +1.66 V), A is more reactive and can displace B. This is the correct statement.
• A will not replace B: This statement would be true if B were more reactive than A, or if neither could displace the other. Since A is more reactive, it can displace B. So, this is incorrect.
• A and B will not replace each other: This would imply they have similar reactivity or are unable to displace each other. Since their oxidation potentials are different, a displacement reaction is possible. This is incorrect. Therefore, A will replace B because its oxidation potential is higher, indicating greater reactivity. Final Answer: \(\boxed{2}\)