Dalton's law of partial pressure will not apply to which of the following mixture of gases

Options

A. `H_2 " and " SO_2`
B. `H_2 " and " Cl_2`
C. `H_2 " and " CO_2`
D. `CO_2 " and " Cl_2`

Answer

To solve the question regarding which mixture of gases Dalton's law of partial pressure will not apply to, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Dalton's Law of Partial Pressure**:
Dalton's law states that the total pressure of a mixture of non-reacting gases is equal to the sum of the partial pressures of each individual gas. This law only applies to gases that do not react with each other.

2. **Identify the Options**:
We need to examine the given options for pairs of gases and determine if they are non-reacting or reacting gases.

3. **Analyze Each Option**:
- **Option 1: H2 and SO2**:
- These gases do not react with each other under normal conditions. Therefore, Dalton's law applies here.
- **Option 2: H2 and Cl2**:
- These gases react to form HCl (hydrochloric acid). Since they are reacting, Dalton's law does not apply here.
- **Option 3: H2 and CO2**:
- These gases do not react with each other. Thus, Dalton's law applies.
- **Option 4: CO2 and Cl2**:
- These gases also do not react with each other. Hence, Dalton's law applies.

4. **Conclusion**:
After analyzing all the options, we find that the only pair of gases that react with each other is H2 and Cl2. Therefore, Dalton's law of partial pressure will not apply to this mixture.

### Final Answer:
The correct answer is **Option 2: H2 and Cl2**.