The Question is from neet-zoology microbes-in-human-welfare , and it was created by the author Mr. BALACHANDRA.N

Question

A real gas deviates most from ideal behavior at STP when it has:

Mr. BALACHANDRA.N · Accepted Answer

## CORE INFORMATION
✓ **Answer**: D
## CONCEPT FRAMEWORK
 **Primary Concept**: Deviation of real gases from ideal gas behavior
 **Related Topics**: Intermolecular forces, molecular size, compressibility factor
 **Prerequisites**: Understanding of the ideal gas law ($PV = nRT$) and the factors that cause real gases to deviate from it.
## SOLUTION PATHWAY
**Given Information**:
  The question asks about the conditions under which a real gas deviates *most* from ideal behavior at STP (Standard Temperature and Pressure).
  **Important conditions**: STP implies relatively low temperature and moderate pressure.
**Method & Steps**:
 1. **Understanding Ideal Gas Behavior**: Ideal gases are assumed to have negligible intermolecular forces and negligible molecular volume.  Real gases, however, experience both.
  Reasoning:  Deviations from ideal behavior are primarily due to intermolecular attractive forces (causing lower pressure than predicted) and finite molecular volume (causing higher pressure than predicted).
  Formula/Rule:  No specific formula, but the concept is central.
 2. **Analyzing the options**:  High molecular mass implies larger molecules, leading to a greater volume occupied by the molecules themselves.  High intermolecular forces lead to stronger attractions between molecules, significantly affecting the pressure.
  Working:  Option D combines both factors. High molecular mass means significant molecular volume, and high intermolecular forces mean substantial deviations due to attractive forces.
  Key Point:  At STP, the effects of both molecular volume and intermolecular forces are significant. Low temperature enhances the effect of intermolecular forces, while moderate pressure allows these effects to be noticeable.
 3. **Conclusion**: A gas with high molecular mass and high intermolecular forces will experience the greatest deviation from ideal gas behavior at STP because both factors contribute significantly to non-ideality under these conditions.
  Result: Option D
  Verification: Options A, B, and C lack one or both of the significant factors causing deviation from ideal behavior at STP.
 ## OPTION ANALYSIS
A :x: Low molecular mass and low intermolecular forces minimize deviations from ideal behavior.
B :x: While high molecular mass contributes to deviation, low intermolecular forces reduce the deviation.
C :x: While high intermolecular forces contribute to deviation, low molecular mass minimizes the effect.
D ✓: High molecular mass and high intermolecular forces maximize deviation from ideal behavior at STP.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Overlooking the combined effect of molecular mass and intermolecular forces: Students might focus on only one factor.
  2.Misunderstanding the effect of STP:  STP is not extremely low temperature or extremely high pressure where other effects dominate.
 **Quick Tips**:
  1.Think about the two main causes of deviation: molecular volume and intermolecular forces.
  2.Remember that at STP, both factors are significant for large molecules with strong intermolecular interactions.

Mr. BALACHANDRA.N · Answer

Low molecular mass and low intermolecular forces

Mr. BALACHANDRA.N · Answer

High molecular mass and low intermolecular forces

Mr. BALACHANDRA.N · Answer

Low molecular mass and high intermolecular forces

Mr. BALACHANDRA.N · Answer

The correct Option is "High molecular mass and high intermolecular forces"

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