Why do salts of the following ions `Cu^(2+),Ba^(2+),Sr^(2+),Ca^(2+),Na^(o+)` and `K^(o+)` impart colour to the flame?

Explanation

To understand why salts of the ions \( \text{Cu}^{2+}, \text{Ba}^{2+}, \text{Sr}^{2+}, \text{Ca}^{2+}, \text{Na}^{+} \), and \( \text{K}^{+} \) impart color to the flame, we can break down the explanation into a series of steps:

### Step-by-Step Solution:

1. **Understanding Flame Test**: The flame test is a qualitative analysis technique used to identify the presence of certain metal ions based on the color they emit when heated in a flame.

2. **Ion Identification**: Different metal ions produce characteristic colors when subjected to a flame:
- \( \text{Cu}^{2+} \): Blue-green flame
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