With `Co^(2+)` ions `NH_(4)SCN` gives a ……..ppt of `(NH_(4))_(2)[Co(CNS)_(4)]` which is soluble in acelone`

Options

A. Blue
B. Green
C. chocolate
D. raddish brown

Answer

To solve the question regarding the reaction of `Co^(2+)` ions with `NH_(4)SCN`, we will follow these steps:

### Step-by-Step Solution:

1. **Identify the Reactants**:
The reactants in this case are `Co^(2+)` ions (cobalt(II) ions) and ammonium thiocyanate (`NH4SCN`).

2. **Understand the Reaction**:
When `Co^(2+)` ions react with ammonium thiocyanate, they form a complex compound. The expected product is `(NH4)2[Co(CNS)4]`.

3. **Determine the Color of the Precipitate**:
The complex `(NH4)2[Co(CNS)4]` is known to form a precipitate. Based on chemical knowledge, cobalt(II) thiocyanate typically forms a blue precipitate.

4. **Solubility in Acetone**:
The question specifies that this precipitate is soluble in acetone. This is an important characteristic of the complex formed.

5. **Final Answer**:
Therefore, the precipitate formed from the reaction of `Co^(2+)` ions with `NH_(4)SCN` is a blue precipitate of `(NH4)2[Co(CNS)4]`, which is soluble in acetone.

### Final Answer:
The color of the precipitate is **blue**.

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