Assertion :The ratio of volume of gaseous reactants and products is in agreement with their molar ratio.
Reason : Volume of a gas is inversely proportional to the number of mole of a gas

Options

A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true

Answer

To solve the question, we will analyze both the assertion and the reason provided.

### Step-by-step Solution:

1. **Understanding the Assertion**:
- The assertion states that "The ratio of volume of gaseous reactants and products is in agreement with their molar ratio."
- According to Avogadro's Law, equal volumes of gases at the same temperature and pressure contain an equal number of molecules (or moles). Therefore, the volume ratio of gaseous reactants and products is indeed proportional to their molar ratio.
- **Conclusion**: The assertion is **True**.

2. **Understanding the Reason**:
- The reason states that "Volume of a gas is inversely proportional to the number of moles of a gas."
- This statement is incorrect. According to the Ideal Gas Law (PV = nRT), the volume (V) of a gas is directly proportional to the number of moles (n) when pressure (P) and temperature (T) are held constant.
- **Conclusion**: The reason is **False**.

3. **Final Evaluation**:
- Since the assertion is true and the reason is false, we conclude that the correct relationship is that the assertion is true while the reason is false.

### Final Answer:
- Assertion: True
- Reason: False