Question

In the following transition metals, the maximum number of oxidation states are exhibited by

• A. chromium (Z = 24)
• B. manganese (Z = 25)
• C. iron (Z = 26)
• D. titanium (Z = 22)

Answer 1

Answer: (B)

manganese (Z = 25)

Answer 2

Manganese shows maximum number of oxidation states because it has 5 unpaired electrons in 3d and also contains 2 electrons in 4s sub-shell. $+ 2 + 3 + 4 + 5 + 6 + 7$
Other metals show the following oxidation states $Cr = +2 +3 +4 +5 +6 , Fe = +2 +3$ and $Ti = +2 +3 + 4$