The Question is from neet-chemistry chemical-thermodynamics kinetic-theory, and it was created by the author Mr. S M HUSSAIN

Question

When the temperature is raised, the viscosity of the liquid decreases. This is because of:

Mr. S M HUSSAIN · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B
## CONCEPT FRAMEWORK
	**Primary Concept**: Effect of temperature on viscosity
	**Related Topics**: Kinetic Molecular Theory, Intermolecular Forces
	**Prerequisites**: Understanding of viscosity, kinetic energy, and intermolecular forces
## SOLUTION PATHWAY
**Given Information**:
	* Temperature is increased.
	* Viscosity of the liquid decreases.
**Method & Steps**:
	1.  Recall that viscosity is the resistance of a fluid to flow. Stronger intermolecular forces lead to higher viscosity.
		Reasoning: Viscosity is related to how easily molecules can move past each other.
		Formula/Rule: None directly applicable
	2.  Understand that increasing temperature increases the kinetic energy of molecules. This increased kinetic energy helps the molecules overcome the attractive intermolecular forces.
		Working: Higher kinetic energy allows molecules to move more freely.
		Key Point: The attractive forces between molecules are what make a liquid viscous. 
	3.  Therefore, increased temperature makes it easier for molecules to move past each other, lowering viscosity.
		Result: Increased temperature leads to decreased viscosity.
		Verification: This aligns with general knowledge about viscosity and temperature.
## OPTION ANALYSIS
[A] :x: Decreased volume does not directly cause the decrease in viscosity. Volume changes with temperature are relatively small for liquids.
[B] ✓: This is the correct explanation. Increased temperature increases kinetic energy, allowing molecules to overcome attractive forces and move more freely, thus decreasing viscosity.
[C] :x: Covalent and hydrogen bonds are relatively strong within a molecule and are not the primary forces affected by a change in temperature to decrease viscosity. Intermolecular forces are the ones that are overcome by temperature.
[D] :x: Increased attraction would lead to increased viscosity, not decreased viscosity.
## LEARNING AIDS
	**Common Mistakes**:
		1. Confusing intramolecular forces (covalent bonds) with intermolecular forces: focus on forces between molecules, not within them.
		2. Thinking that volume changes are the reason for viscosity changes, not the kinetic energy of molecules.
	**Quick Tips**:
		1. Remember that increased temperature leads to increased molecular motion.
		2. Think of viscosity as a measure of how 'sticky' a liquid is. Less stickiness means lower viscosity.

Mr. S M HUSSAIN · Answer

Decreased volume of the solution

Mr. S M HUSSAIN · Answer

The correct Option is "Increase in temperature increases the average kinetic energy of molecules which overcome the attractive force between them"

Mr. S M HUSSAIN · Answer

Decreased covalent and hydrogen bond forces

Mr. S M HUSSAIN · Answer

Increased attraction between the molecules

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