Complete the following using the correct word from those given in the brackets.
On adding ammonium hydroxide to a solution of copper sulphate, a precipitate is formed which is ……….. in excess reagent. (soluble/insoluble)

Explanation

To solve the question, we need to analyze the reaction that occurs when ammonium hydroxide is added to a solution of copper sulfate.

### Step-by-Step Solution:

1. **Identify the Reactants**: The reactants in this scenario are copper sulfate (CuSO₄) and ammonium hydroxide (NH₄OH).

2. **Understand the Reaction**: When ammonium hydroxide is added to copper sulfate, a precipitate is formed. This precipitate is copper hydroxide (Cu(OH)₂), which is a pale blue solid.

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