NEET Chemistry NEET PYQ-The d-and f-Block Elements

Of the following transition metals, the maximum numbers of oxidation states are exhibited by: [AIPMT 2000]

A) chromium \[(Z=24)\]

B) manganese \[(Z=25)\]

C) iron \[(Z=26)\]

D) titanium \[(Z=22)\]

Correct Answer: B

Solution :

[b] Manganese shows maximum number of oxidation states because it has S unpaired electrons in 3d and also contains 2 electrons in 4s-subshell.

\[+2,+3,+4,+5,+6,+7\]

Other metals show the following oxidation states

\[Cr=+2,\text{ }+3,\text{ }+4,\text{ }+5,\text{ }+6\]

\[Fe=+\,2,\text{ }+3\]

\[Ti=+2,\text{ }+3,+4\]