Which of the following does not give flame test?

Options

A. Na
B. Sr
C. K
D. Zn

Answer

To determine which of the following elements does not give a flame test, we need to analyze the elements provided: sodium (Na), strontium (Sr), and zinc (Zn).

### Step-by-Step Solution:

1. **Understanding Flame Tests**:
- Flame tests are used to identify the presence of certain metal ions based on the color they emit when heated in a flame.
- Alkali metals (Group 1) and alkaline earth metals (Group 2) typically give distinct flame colors.

2. **Identifying the Elements**:
- Sodium (Na) is an alkali metal and will give a bright yellow flame.
- Strontium (Sr) is an alkaline earth metal and will produce a red flame.
- Zinc (Zn) is a transition metal and is not in Group 1 or Group 2.

3. **Analyzing Zinc**:
- Zinc does not produce a characteristic flame color when subjected to a flame test. Instead, it may produce a white oxide when heated, but it does not give a flame test like sodium or strontium.

4. **Conclusion**:
- Among the given options, zinc (Zn) does not give a flame test, while sodium (Na) and strontium (Sr) do.

### Final Answer:
**Zinc (Zn) does not give a flame test.**

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