The Question is from NEET guide , and it was created by the author CHANDRAKANTH

Question

The partial pressure of a dry gas is:

CHANDRAKANTH · Accepted Answer

## CORE INFORMATION
✓ **Answer**: A
## CONCEPT FRAMEWORK
	**Primary Concept**: Partial Pressure and Dalton's Law
	**Related Topics**: Vapor Pressure, Ideal Gas Law
	**Prerequisites**: Basic understanding of gas mixtures and pressure.
## SOLUTION PATHWAY
**Given Information**:
	*  Dry gas is compared to wet gas.
	*  Wet gas contains water vapor.
**Method & Steps**:
	1. **Understanding Wet Gas**: Wet gas is a mixture of a dry gas and water vapor. The total pressure of a wet gas is the sum of the partial pressure of the dry gas and the partial pressure (or vapor pressure) of water.
		Reasoning: Dalton's Law of Partial Pressures states that in a mixture of non-reacting gases, the total pressure exerted is equal to the sum of the partial pressures of the individual gases.
		Formula/Rule: P_total = P_gas1 + P_gas2 + ...
	2. **Comparing Dry and Wet Gas Pressures**: If the total pressure of wet gas is the sum of the pressure of dry gas and water vapor, then the partial pressure of dry gas must be less than the total pressure of the wet gas.
		Working: P_wet = P_dry + P_water; therefore P_dry = P_wet - P_water. Since P_water > 0, P_dry < P_wet.
		Key Point: The vapor pressure of water is always a positive value.
	3. **Final Answer**: The partial pressure of a dry gas is less than that of wet gas.
		Result: Option A is correct.
		Verification: The concept aligns with Dalton's Law.
 ## OPTION ANALYSIS
[A] ✓: The partial pressure of the dry gas is less because the wet gas also contains water vapor pressure.
[B] :x: The partial pressure of a dry gas is not greater than that of a wet gas as wet gas includes partial pressure of water vapor.
[C] :x: The partial pressures are not equal, because the wet gas includes the partial pressure of water vapor in addition to the dry gas.
[D] :x: Option A is correct, thus this is not the correct answer.
 ## LEARNING AIDS
	**Common Mistakes**:
		1. **Forgetting Vapor Pressure**: Neglecting the contribution of water vapor pressure in a wet gas.
			How to avoid: Always remember that wet gas contains water vapor.
		2. **Misunderstanding Dalton's Law**: Not correctly applying the law to partial pressures in a mixture.
			How to avoid: Review the definition and application of Dalton's Law of Partial Pressures.
	**Quick Tips**:
		1. **Think of Wet Gas as a Mixture**: Remember wet gas is a mixture of dry gas and water vapor.
		2. **Vapor Pressure is Always Positive**:  The partial pressure of water vapor is always positive.

CHANDRAKANTH · Answer

The correct Option is "Less than that of wet gas"

CHANDRAKANTH · Answer

Greater than that of wet gas

CHANDRAKANTH · Answer

Equal to that of wet gas

CHANDRAKANTH · Answer

None of the above

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