The Question is from neet-chemistry principles-related-to-practical-chemistry , and it was created by the author Mr. S M HUSSAIN

Question

Which statement regarding cationic detergents is FALSE?

Mr. S M HUSSAIN · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
	**Primary Concept**: Properties of cationic detergents
	**Related Topics**: Surfactants, cleaning agents, hard water
	**Prerequisites**: Understanding of ionic interactions, hydrophilic and hydrophobic groups
## SOLUTION PATHWAY
**Given Information**:
	The question asks to identify the false statement about cationic detergents.
	Options describe various properties and behaviors of cationic detergents.
**Method & Steps**:
	1. Analyze each option to determine its accuracy regarding cationic detergents.
		Reasoning: Cationic detergents have a positively charged head and a long hydrophobic tail.  Their behavior in hard water and interaction with other surfactants needs to be considered.
		Formula/Rule: None directly applicable, but understanding of ionic interactions is crucial.
	2. Evaluate the truthfulness of each statement.
		Working: Option A is true; cationic detergents have a positively charged hydrophilic head. Option B is true; they are used as softeners and germicides due to their properties. Option C is false; cationic detergents are *not* effective in hard water because the positively charged head interacts with the negatively charged calcium and magnesium ions present in hard water, leading to reduced cleaning efficiency. Option D is true; their positive charge interacts with the negative charge of anionic surfactants, reducing their effectiveness.
		Key Point: The interaction of ionic detergents with hard water ions is key to understanding their effectiveness.
	3. Identify the false statement.
		Result: Option C is the false statement.
		Verification:  The interaction of cationic detergents with hard water ions reduces their effectiveness, making option C false.
## OPTION ANALYSIS
A ✓: This statement is true. Cationic detergents are characterized by their positively charged hydrophilic head.
B :x: This statement is true. Cationic detergents have applications as fabric softeners and germicides.
C :x: This statement is false. Cationic detergents are less effective in hard water due to interactions with calcium and magnesium ions.
D :x: This statement is true. Anionic surfactants will negatively impact the cleaning ability of cationic detergents.
## LEARNING AIDS
	**Common Mistakes**:
		1.Confusing cationic with anionic detergents: Remembering that cationic detergents possess a positive charge is crucial for understanding their behavior.
		2.Overlooking the impact of hard water ions: Hard water ions affect the performance of different types of detergents differently.  Understanding these interactions is essential.
	**Quick Tips**:
		1.Focus on the charge of the hydrophilic head to distinguish between different types of detergents.
		2.Remember that cationic detergents are less effective in hard water.

Mr. S M HUSSAIN · Answer

They possess a positively charged hydrophilic head group.

Mr. S M HUSSAIN · Answer

They are often used as fabric softeners and germicides.

Mr. S M HUSSAIN · Answer

The correct Option is "They are effective cleaning agents in hard water due to their insensitivity to calcium and magnesium ions."

Mr. S M HUSSAIN · Answer

Their effectiveness is reduced by anionic surfactants.

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