Question

Standard electrode potential of three metals X, Y and Z are \(-1.2\) V, \(+0.5\) V and \(-3.0\) V respectively. The reducing power of these metals will be

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

Hint:

The more negative the standard electrode potential, the stronger the metal is as a reducing agent.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept
Standard electrode (reduction) potential measures how easily the ion is reduced. A more negative value means the metal loses electrons more easily.

Step 2: Order of potentials
Z (\(-3.0\text{ V}\)) \(\lt\) X (\(-1.2\text{ V}\)) \(\lt\) Y (\(+0.5\text{ V}\)).

Step 3: Conclusion
Reducing power increases as the potential becomes more negative, so Z \(\gt\) X \(\gt\) Y.

Final Answer:
The reducing power order is Z, then X, then Y. \[ \boxed{\text{(C) }Z\gt X\gt Y} \]