State two relevant observation
Ammonium hydroxide solution is added to copper (II) nitrate solution in small quantities and then in excess.

Explanation

To solve the question, we will analyze the reactions that occur when ammonium hydroxide (NH4OH) is added to copper(II) nitrate (Cu(NO3)2) solution in small quantities and then in excess.

### Step-by-Step Solution:

1. **Reaction with Small Quantities of Ammonium Hydroxide**:
- When a small amount of ammonium hydroxide is added to copper(II) nitrate solution, a precipitate forms.
- The reaction can be represented as:
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