microcosmic salt bead test of salt (X) yields semi - translucent mass. Therefore it contains

Options

A. `Co(NO_3)_2`
B. `Ca(NO_3)_2`
C. `CuSO_4`
D. `MnSO_4`

Answer

To solve the problem regarding the microcosmic salt bead test of salt (X) that yields a semi-translucent mass, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Microcosmic Salt Bead Test**:
- The microcosmic salt bead test is a qualitative analysis method used to identify certain metal ions based on the color and nature of the bead formed when the salt is heated with microcosmic salt (sodium ammonium hydrogen phosphate, NaNH4HPO4).

2. **Identifying the Result of the Test**:
- The problem states that the test yields a semi-translucent mass. This indicates the presence of certain metal ions that can form silicates or phosphates that are semi-translucent.

3. **Analyzing Possible Cations**:
- The semi-translucent mass suggests that the salt (X) likely contains a cation that can form a silicate or phosphate. Common cations that can produce such results include calcium (Ca²⁺), cobalt (Co²⁺), copper (Cu²⁺), and manganese (Mn²⁺).

4. **Considering the Chemical Reactions**:
- When microcosmic salt is heated, it decomposes to form sodium phosphate (NaPO3) and other products. If calcium ions are present, they can react to form calcium silicate (CaSiO3), which is known to be semi-translucent.

5. **Identifying the Correct Salt**:
- Among the options provided, we need to determine which salt contains Ca²⁺. Calcium nitrate (Ca(NO3)2) is one such salt that contains calcium ions.

6. **Conclusion**:
- Since the test yields a semi-translucent mass and the only option that contains calcium ions is calcium nitrate, we conclude that salt (X) contains calcium ions.

### Final Answer:
The salt (X) contains **Ca²⁺ ions**, specifically in the form of **calcium nitrate (Ca(NO3)2)**.

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