On adding excess of ammonium hydroxide to a copper chloride solution

Options

A. A deep blue solution is obtained
B. No change is observed
C. Blue precipitate of copper hydroxide is obtained
D. Black precipitate of copper oxide is obtained

Explanation

To solve the question regarding the reaction that occurs when excess ammonium hydroxide is added to a copper chloride solution, let's break it down step by step:

### Step 1: Identify the Reactants
- The reactants in this reaction are **ammonium hydroxide (NH4OH)** and **copper(II) chloride (CuCl2)**.

### Step 2: Write the Reaction
- When ammonium hydroxide is added to copper(II) chloride, a complex ion is formed. The reaction can be represented as:
\[ \text{CuCl}_2 + 4 \text{NH}_4\text{OH} \rightarrow \text{Cu(NH}_3)_4\text{Cl}_2 + 2 \text{H}_2\text{O} + 2 \text{HCl} \]

### Step 3: Identify the Product
- The product formed is **tetramine copper(II) chloride**, which has the formula **Cu(NH3)4Cl2**.

### Step 4: Analyze the Properties of the Product
- The tetramine copper(II) chloride is known to produce a **deep blue solution** when dissolved in water.

### Step 5: Conclusion
- Therefore, the addition of excess ammonium hydroxide to a copper chloride solution results in the formation of a deep blue solution of tetramine copper(II) chloride.

### Final Answer
- The solution obtained is a **deep blue solution**, confirming that the reaction produces **tetramine copper(II) chloride**.