Question

The increasing order of reducing ability of metals X, Y, and Z, given their reduction electrode potentials:
\( E^\circ_X = +0.52V, \quad E^\circ_Y = -3.03V, \quad E^\circ_Z = -1.18V \)

• A. \( X > Y > Z \)
• B. \( Y > Z > X \)
• C. \( Z > X > Y \)
• D. \( Z > Y > X \)

Hint:

More negative reduction potential means stronger reducing power, leading to easier electron donation.

Answer 1

The Correct Option is D

Step 1: Understanding Reduction Potential and Reducing Ability The reducing ability of a metal is inversely related to its standard reduction potential. A lower (more negative) reduction potential means a stronger reducing agent. \[ \text{Order of reducing ability} = \text{Lower } E^\circ \text{ value } \Rightarrow \text{Stronger reducing agent} \] Given \( E^\circ_X = +0.52V, E^\circ_Y = -3.03V, E^\circ_Z = -1.18V \), we arrange them in increasing reducing ability as: \[ Z>Y>X \]