On heating blue coloured powder of copper(II) nitrate in a boiling tube, copper oxide (black), oxygen gas an a brown gas 'X' is formed. Identify the brown gas 'X'.

Explanation

To identify the brown gas 'X' formed during the heating of copper(II) nitrate, we can follow these steps:

### Step 1: Write the chemical formula of copper(II) nitrate.
Copper(II) nitrate is represented by the formula \( \text{Cu(NO}_3\text{)}_2 \).

### Step 2: Understand the decomposition reaction.
When copper(II) nitrate is heated, it undergoes a decomposition reaction. This means it breaks down into simpler substances.

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