Question

Standard reduction electrode potentials of three metals A, B, and C are respectively $+0.5V,-3.0V$ and $-1.2V.$ The reducing power if these metals are:

• A. $C>B>A$
• B. $A>C>B$
• C. $B>C>A$
• D. $A>B>C$

Answer 1

The correct option is C $B>C>A$

• Redox potential is a measure of the tendency of a chemical species to acquire electrons from or lose electrons to an electrode and thereby be reduced or oxidized respectively.
• The higher the standard reduction potential higher will be the tendency of that element to get reduced ( that means strong oxidizing agent ).
• The lower the standard reduction potential, the higher will be the tendency of that element to get oxidized ( that means good reducing agent ).
• Now B has minimum standard reduction potential which means it is the strongest reducing agent. So the correct sequence of reducing the power of elements will be $B>C>A.$

Option C is correct.