Which one of the following statement is correct?

Options

A. From a mixed precipitate of `AgCl` and `Agl`,ammonia solution dissolves only `AgCl`
B. Ferric ions gave a deep green precipitate on adding potassium ferrocyanide solution.
C. On boiling a solution having `K^(+),Ca^(2+)` and `HCO_(3)^(-)` ions we get a precipitate of `K_(2)Ca(CO_(3))_(2)`
D. Manganese salts give a violet borax bead test in the reducing flame

Explanation

To determine which statement is correct, we will analyze each option one by one.

### Step 1: Analyze the First Statement
The first statement claims that from a mixture of precipitate of AgCl and AgI, ammonia dissolves only AgCl.

- **Explanation**: When ammonia is added to a mixture of AgCl and AgI, it reacts with AgCl to form a soluble complex, [Ag(NH3)2]+. However, AgI does not react with ammonia and remains insoluble. Therefore, this statement is correct.

### Step 2: Analyze the Second Statement
The second statement states that ferric ions give a deep green precipitate on adding potassium ferrocyanide.

- **Explanation**: When potassium ferrocyanide is added to a solution containing ferric ions (Fe³⁺), it forms a blue precipitate known as Turnbull's blue (Fe3[Fe(CN)6]2). Therefore, this statement is incorrect.

### Step 3: Analyze the Third Statement
The third statement mentions that on boiling a solution of K⁺, Ca²⁺, and HCO3⁻ ions, we get a precipitate of K2CaCO3 whole twice.

- **Explanation**: When K⁺ and Ca²⁺ ions are present with HCO3⁻ ions, boiling the solution leads to the formation of calcium carbonate (CaCO3) as a precipitate, but not K2CaCO3. The correct formula for the precipitate would be CaCO3. Therefore, this statement is incorrect.

### Step 4: Analyze the Fourth Statement
The fourth statement claims that manganese salts give a violet borax bead test in a reducing flame.

- **Explanation**: Manganese salts typically give a greenish color in the borax bead test, not violet. Therefore, this statement is also incorrect.

### Conclusion
After analyzing all four statements, we find that the first statement is the only correct one.

**Correct Answer**: The first statement is correct: "From a mixture of precipitate of AgCl and AgI, ammonia dissolves only AgCl."

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