`CuSO_(4)` reacts with `NH_(3)` to give blue complex of

Options

A. copper ammonium sulphate
B. copper ammonium hydroxide
C. Both (a) and (b)
D. None of these

Answer

To solve the question regarding the reaction of CuSO₄ with NH₃ to form a blue complex, we can follow these steps:

### Step 1: Identify the Reactants
The reactants in this reaction are copper(II) sulfate (CuSO₄) and ammonia (NH₃).

### Step 2: Understand the Reaction
When copper(II) sulfate reacts with ammonia, it forms a complex. Ammonia acts as a ligand and coordinates with the copper ion.

### Step 3: Determine the Product
The product formed from the reaction of CuSO₄ and NH₃ is known as copper ammonium sulfate. The chemical formula for this complex is [Cu(NH₃)₄]SO₄. This complex is characterized by its blue color.

### Step 4: Analyze the Options
The options provided are:
1. Copper ammonium sulfate
2. Copper ammonium hydroxide
3. Both A and B
4. None of these

Since we established that the product is copper ammonium sulfate, we can conclude that option A is correct.

### Step 5: Conclusion
The blue complex formed when CuSO₄ reacts with NH₃ is copper ammonium sulfate, which corresponds to option A.

### Final Answer
The correct answer is **Copper ammonium sulfate (Option A)**.

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