Answer the question on the basis of passage given below:

For the Transition Elements.

Which transition metal has the greatest number of oxidation state?

Mn

The correct answer is Option (2) → Mn.

To determine which transition metal has the greatest number of oxidation states, let's examine the common oxidation states for each of the given transition metals:

Oxidation States of Each Metal

1. Chromium (Cr):

Common oxidation states: +2, +3, +6

Total oxidation states: 3

2. Manganese (Mn):

Common oxidation states: +2, +3, +4, +6, +7

Total oxidation states: 5

3. Iron (Fe):

Common oxidation states: +2, +3

Total oxidation states: 2

4. Nickel (Ni):

Common oxidation states: +2, +3

Total oxidation states: 2

Conclusion

Based on the analysis, Manganese (Mn) has the greatest number of oxidation states, which are +2, +3, +4, +6, and +7.

Therefore, the correct answer is: Mn.