Which of the following gaseous mixture does not follow Dalton's law of partial pressure?

Options

A. `SO_(2) and Cl_(2)`
B. `CO_(2) and N_(2)`
C. `CO and CO_(2)`
D. `CO and N_(2)`

Explanation

To determine which gaseous mixture does not follow Dalton's law of partial pressure, we need to understand the principle behind Dalton's law and analyze the given options.

### Step-by-Step Solution:

1. **Understand Dalton's Law of Partial Pressure**:
Dalton's law states that in a mixture of non-reacting gases, the total pressure exerted by the mixture is equal to the sum of the partial pressures of each individual gas. Mathematically, it can be expressed as:
\[ P_{total} = P_1 + P_2 + P_3 + \ldots \]
where \(P_1, P_2, P_3, \ldots\) are the partial pressures of the individual gases.

2. **Identify the Requirement for Dalton's Law**:
For Dalton's law to be applicable, the gases in the mixture must be non-reactive. If the gases react with each other, the formation of new compounds alters the pressures and the law does not hold.

3. **Analyze the Given Options**:
- **Option A: SO2 and Cl2**: This mixture is reactive because sulfur dioxide (SO2) reacts with chlorine (Cl2) to form sulfuryl chloride (SO2Cl2). Therefore, this mixture does not follow Dalton's law.
- **Option B: CO2 and N2**: Both carbon dioxide (CO2) and nitrogen (N2) are non-reactive with each other under normal conditions. Hence, this mixture follows Dalton's law.
- **Option C: CO and CO2**: Carbon monoxide (CO) and carbon dioxide (CO2) do not react with each other in a way that would affect their partial pressures significantly. Thus, this mixture follows Dalton's law.
- **Option D: CO and N2**: Carbon monoxide (CO) and nitrogen (N2) are also non-reactive with each other, so this mixture follows Dalton's law.

4. **Conclusion**:
The only mixture that does not follow Dalton's law of partial pressure is **Option A: SO2 and Cl2**, as it involves a chemical reaction.

### Final Answer:
**Option A: SO2 and Cl2 does not follow Dalton's law of partial pressure.**