The element that is not present in misch metal is

Options

A. La
B. Iron
C. Na
D. Ce

Answer

To determine the element that is not present in misch metal, we will analyze the composition of misch metal and compare it with the given options.

### Step-by-Step Solution:

1. **Understanding Misch Metal**:
- Misch metal is an alloy primarily made of rare earth elements. It is commonly used in various applications, including lighter and torches.

2. **Composition of Misch Metal**:
- The main components of misch metal include:
- 50% Cerium
- 25% Lanthanum
- Small amounts of Neodymium and Praseodymium
- Traces of Iron, Sulfur, Carbon, Calcium, and Aluminum

3. **Analyzing the Options**:
- Now, we will evaluate the options provided in the question to identify which element is not present in misch metal.
- **Option 1: Lanthanum** - Present (25% of the composition)
- **Option 2: Iron** - Present (traces of iron are included)
- **Option 3: Sodium** - Not present (no mention of sodium in the composition)
- **Option 4: Cerium** - Present (50% of the composition)

4. **Conclusion**:
- From the analysis, we can conclude that the element that is not present in misch metal is **Sodium**.

### Final Answer:
The element that is not present in misch metal is Sodium.

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