The set containing only transition metals is

Options

A. Ti, Nb, Ra
B. Pd,lr, Ta
C. Ag,Au,In
D. W,Pt,Po

Answer

To determine the set containing only transition metals, we need to identify which elements belong to the d-block of the periodic table, as transition metals are defined as the elements found in this block.

### Step-by-Step Solution:

1. **Identify Transition Metals**: Transition metals are defined as the elements that have partially filled d-subshells. They are primarily found in groups 3 to 12 of the periodic table.

2. **Analyze the Given Sets**:
- **Set 1**: Ti, Ra
- Titanium (Ti) is a transition metal (d-block).
- Radium (Ra) is an alkaline earth metal (s-block).
- **Conclusion**: This set is incorrect as it contains a non-transition metal.

- **Set 2**: Pd, Ir, Ta
- Palladium (Pd), Iridium (Ir), and Tantalum (Ta) are all transition metals (d-block).
- **Conclusion**: This set is correct as it contains only transition metals.

- **Set 3**: Ag, Au, In
- Silver (Ag) and Gold (Au) are transition metals (d-block).
- Indium (In) is a post-transition metal (p-block).
- **Conclusion**: This set is incorrect as it contains a non-transition metal.

- **Set 4**: Co, Ni, Po
- Cobalt (Co) and Nickel (Ni) are transition metals (d-block).
- Polonium (Po) is a metalloid and belongs to the p-block.
- **Conclusion**: This set is incorrect as it contains a non-transition metal.

3. **Final Conclusion**: The only set that contains only transition metals is **Set 2: Pd, Ir, Ta**.