Radium is obtained from

Options

A. Limestone
B. Rutile
C. Pitchblende
D. Barytes

Answer

To determine the source from which radium is obtained, we need to analyze the options provided:

1. **Limestone (CaCO3)**: This mineral is primarily composed of calcium carbonate and is the main ore for calcium, not radium.

2. **Rutile (TiO2)**: Rutile is primarily composed of titanium dioxide and is the chief ore for titanium. It does not contain radium.

3. **Pitch Blend (UO2)**: Pitch blend is a radioactive ore, primarily composed of uranium oxides. It is known to be the chief source of radium, as radium is often found in uranium ores.

4. **Barite (BaSO4)**: Barite is composed of barium sulfate and serves as the primary ore for barium, not radium.

From this analysis, we can conclude that the correct answer is:

**Radium is obtained from Pitch Blend.**

### Step-by-Step Solution:
1. Identify the ores listed in the options.
2. Analyze the composition of each ore.
3. Determine which ore is associated with radium.
4. Conclude that Pitch Blend is the source of radium.