With respect to d block elements:
The 3d block element that exhibits maximum number of oxidation states:

Options

A. Mn
B. Sc
C. Ti
D. Zn

Answer

To determine the 3d block element that exhibits the maximum number of oxidation states, we will analyze the electronic configurations and oxidation states of the relevant d-block elements.

### Step 1: Identify the 3d block elements
The 3d block elements include Scandium (Sc), Titanium (Ti), Manganese (Mn), Iron (Fe), Cobalt (Co), Nickel (Ni), Copper (Cu), and Zinc (Zn).

### Step 2: Write the electronic configurations
- Scandium (Sc): [Ar] 3d¹ 4s²
- Titanium (Ti): [Ar] 3d² 4s²
- Manganese (Mn): [Ar] 3d⁵ 4s²
- Iron (Fe): [Ar] 3d⁶ 4s²
- Cobalt (Co): [Ar] 3d⁷ 4s²
- Nickel (Ni): [Ar] 3d⁸ 4s²
- Copper (Cu): [Ar] 3d¹⁰ 4s¹
- Zinc (Zn): [Ar] 3d¹⁰ 4s²

### Step 3: Determine the oxidation states
- **Scandium (Sc)**: Can exhibit +1 and +3 oxidation states.
- **Titanium (Ti)**: Can exhibit +2, +3, and +4 oxidation states.
- **Manganese (Mn)**: Can exhibit oxidation states from +1 to +7 (i.e., +1, +2, +3, +4, +5, +6, +7).
- **Iron (Fe)**: Can exhibit +2 and +3 oxidation states.
- **Cobalt (Co)**: Can exhibit +2 and +3 oxidation states.
- **Nickel (Ni)**: Can exhibit +2 oxidation state.
- **Copper (Cu)**: Can exhibit +1 and +2 oxidation states.
- **Zinc (Zn)**: Primarily exhibits +2 oxidation state.

### Step 4: Identify the element with the maximum oxidation states
From the analysis, we see that:
- Manganese (Mn) exhibits the maximum number of oxidation states, which is 7 (from +1 to +7).

### Conclusion
The 3d block element that exhibits the maximum number of oxidation states is **Manganese (Mn)**.

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