Name two poisonous gases which can be prepared from chlorine gas.

Explanation

To answer the question regarding the two poisonous gases that can be prepared from chlorine gas (Cl2), we will follow a step-by-step approach.

### Step-by-Step Solution:

1. **Identify the Gases**: We need to name two poisonous gases that can be synthesized from chlorine gas.

2. **First Poisonous Gas - Phosgene**:
- **Chemical Formula**: The first poisonous gas is phosgene, which has the chemical formula COCl2.
...