`NH_(4)SCN` can be used to make distanction between `Cu^(2+)` and `Co^(2+)`.

Explanation

To determine whether ammonium thiocyanate (NH₄SCN) can be used to distinguish between Cu²⁺ and Co²⁺ ions, we can analyze the reactions that occur when these ions are treated with NH₄SCN.

### Step-by-Step Solution:

1. **Identify the Ions and Reagents**:
- The ions in question are Cu²⁺ (copper ion) and Co²⁺ (cobalt ion).
- The reagent used for the distinction is ammonium thiocyanate (NH₄SCN).

2. **Reactions with Cobalt Ion (Co²⁺)**:
- When Co²⁺ reacts with NH₄SCN, it forms a complex ion.
- The balanced reaction can be represented as:
\[ \text{CoCl}_2 + 2 \text{NH}_4\text{SCN} \rightarrow \text{[Co(SCN)_4]}^{2-} + 2 \text{NH}_4\text{Cl} \]
- This complex is typically blue in color.

3. **Reactions with Copper Ion (Cu²⁺)**:
- When Cu²⁺ reacts with NH₄SCN, it forms a different complex.
- The balanced reaction can be represented as:
\[ \text{CuCl}_2 + 2 \text{NH}_4\text{SCN} \rightarrow \text{Cu(SCN)_2} + 2 \text{NH}_4\text{Cl} \]
- This reaction produces a black precipitate of copper thiocyanate (Cu(SCN)₂).

4. **Observation of Color Change**:
- The formation of a blue complex with Co²⁺ and a black precipitate with Cu²⁺ allows for visual distinction between the two ions.
- Therefore, the presence of a blue solution indicates Co²⁺, while the formation of a black precipitate indicates Cu²⁺.

5. **Conclusion**:
- Based on the reactions and the resulting colors, it is correct to say that NH₄SCN can be used to distinguish between Cu²⁺ and Co²⁺ ions.

### Final Answer:
Yes, NH₄SCN can be used to distinguish between Cu²⁺ and Co²⁺ ions based on the color of the resulting complexes.

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