Question

Which one of the following shows highest magnetic moment?

• A. V3+
• B. Cr3+
• C. Fe3+
• D. Co3+

Answer 1

Answer: (A)

V3+

Answer 2

Cr3+ + e— $\longrightarrow$ Cr2+, EQ = – 0.41 volts and Mn3+ + e— $\longrightarrow$ Mn2+ , EQ = + 1.51 volts

This shows that Cr2+ is unstable and has a tendency to acquire more stable Cr3+ state by acting as a reducing agent. On the other hand Mn3+ is unstable and is reduced to more stable Mn2+ state.