Metal (M) shows crimson red colour in flame test and its halide is deliquescent then metal (M) could be :

Options

A. Li
B. Mg
C. Ca
D. Ba

Answer

To solve the question step by step, we will analyze the information provided and draw conclusions based on chemical properties.

### Step 1: Analyze the Flame Test Color
The question states that the metal (M) shows a crimson red color in a flame test. We need to identify which metals can produce this color.

- **Crimson Red Color**: This color in a flame test is characteristic of lithium. Other metals may produce red colors, but they are usually of different shades (e.g., calcium gives a brick red color).

**Hint**: Recall the flame test colors associated with different metals to identify the one that matches the description.

### Step 2: Check the Deliquescent Property of Halides
Next, we need to consider the property of the halide of the metal (M). The question states that the halide is deliquescent, meaning it can absorb moisture from the air and dissolve in it.

- **Lithium Halides**: Lithium halides (like lithium chloride) are known to be deliquescent. They can absorb water vapor from the atmosphere, forming a solution.

**Hint**: Look up the properties of halides of the metals you suspect to see which ones are deliquescent.

### Step 3: Conclusion
Based on the analysis:
- The metal that produces a crimson red color in the flame test is lithium.
- The halide of lithium is deliquescent.

Thus, the metal (M) could be **lithium (Li)**.

**Final Answer**: The metal (M) could be lithium.