The Question is from neet-physics mechanical-properties-of-fluids work-and-surface-energy, and it was created by the author SUBHANI

Question

Mercury does not wet glass because

SUBHANI · Accepted Answer

## CORE INFORMATION
✓ **Answer**: [B]
## CONCEPT FRAMEWORK
	**Primary Concept**: Surface tension and intermolecular forces
	**Related Topics**: Cohesive and adhesive forces, wetting and non-wetting, angle of contact
	**Prerequisites**: Basic understanding of intermolecular forces and their relation to surface phenomena
## SOLUTION PATHWAY
**Given Information**:
	* Mercury does not wet glass.
**Method & Steps**:
	1. **Understanding Wetting**: Wetting occurs when adhesive forces between a liquid and a solid are stronger than cohesive forces within the liquid. This allows the liquid to spread on the solid surface.
		Reasoning: This is the definition of wetting.
	2. **Understanding Non-Wetting**: Non-wetting occurs when cohesive forces within the liquid are stronger than adhesive forces between the liquid and solid. This causes the liquid to form droplets instead of spreading.
		Reasoning: This is the definition of non-wetting.
	3. **Applying to Mercury and Glass**: Since mercury does not wet glass, it means cohesive forces within mercury are stronger than the adhesive forces between mercury and glass.
		Reasoning: Direct application of the principles to the situation.
	4. **Conclusion**: Therefore, the cohesive force is much greater than the adhesive force.
		Result: The correct option is B.
 ## OPTION ANALYSIS
[A] :x: This would mean the liquid neither wets nor forms droplets, which is not the case with mercury and glass.
[B] ✓: This is correct; stronger cohesive forces than adhesive forces lead to non-wetting.
[C] :x: This would mean the liquid would wet the surface, which is not what happens with mercury and glass.
[D] :x: While the angle of contact is related to wetting, it is not the reason why mercury does not wet glass. The angle of contact is a result of the force balance.
 ## LEARNING AIDS
	**Common Mistakes**:
		1. Confusing cohesive and adhesive forces: Remember cohesive forces are within a liquid, while adhesive forces are between different substances.
		2. Relating angle of contact as the cause instead of a result: Angle of contact is a result of the balance between adhesive and cohesive forces.
	**Quick Tips**:
		1. Think of water on a clean surface (wetting) vs. water on a waxy surface (non-wetting) to understand the difference.
		2. Remember that mercury is a metal with strong metallic bonds, thus having strong cohesive forces.

SUBHANI · Answer

Cohesive force is equal to adhesive force

SUBHANI · Answer

The correct Option is "Cohesive force is much greater than adhesive force"

SUBHANI · Answer

Cohesive force is less than adhesive force

SUBHANI · Answer

Angle of contact is ${90^{\rm{o}}}$

NEET Physics Mechanical Properties Of Fluids Work & Surface Energy MCQs

Select Topic

Question Tags

Question Tags

Question Tags

Question Tags

Question Tags

Question Tags

Question Tags

Question Tags

Question Tags

Question Tags

NEET Subjects

Our Bots

Company