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

Question

The best method to test whether a clear liquid is water, is to:

Mr. S M HUSSAIN · Accepted Answer

## CORE INFORMATION
✓ **Answer**: D
## CONCEPT FRAMEWORK
	**Primary Concept**: Chemical identification of water
	**Related Topics**: Properties of water, chemical tests, anhydrous copper sulfate
	**Prerequisites**: Basic knowledge of chemical tests and properties of water
## SOLUTION PATHWAY
**Given Information**:
	* We need to identify a clear liquid as water
	* We are given four options for testing.
**Method & Steps**:
	1. **Evaluate each option**: 
		Reasoning: We need to determine which method will specifically identify water and rule out other liquids.
	2. **Analyze Option A (Taste)**:
		Working: Tasting is not a safe way to identify a liquid, especially if its nature is unknown
		Key Point: This is a safety hazard.
	3. **Analyze Option B (Smell)**:
		Working: Water is generally odorless, so this method is unreliable.
		Key Point: Many liquids are odorless.
	4. **Analyze Option C (Litmus paper)**:
		Working: Litmus paper tests for acidity or alkalinity, not for the presence of water
		Key Point: Water is neutral, but so are many other solutions.
	5. **Analyze Option D (Anhydrous copper sulphate)**:
		Working: Anhydrous copper sulphate is white, and it turns blue in the presence of water.
		Key Point: This is a specific chemical test for water.
	6. **Final step**: 
		Result: Option D is the correct test for water.
		Verification: The color change of anhydrous copper sulfate is a well-established chemical test for water.
 ## OPTION ANALYSIS
[A] :x: Tasting is unsafe and not a reliable test.
[B] :x: Water is odorless, making this unreliable.
[C] :x: Litmus paper tests acidity/alkalinity, not water presence.
[D] ✓: Anhydrous copper sulfate turns blue in the presence of water, confirming its presence.
 ## LEARNING AIDS
	**Common Mistakes**:
		1.[Error 1]: Choosing taste or smell: This is unsafe and unreliable for chemical identification.
		2.[Error 2]: Confusing litmus paper test: Litmus tests for pH, not specifically water.
	**Quick Tips**:
		1.[Helpful shortcut]: Remember the anhydrous copper sulfate test as a specific test for water.
		2.[Memory aid]: Associate blue color with water and anhydrous copper sulfate.

Mr. S M HUSSAIN · Answer

Taste the liquid

Mr. S M HUSSAIN · Answer

Smell the liquid

Mr. S M HUSSAIN · Answer

Add litmus paper

Mr. S M HUSSAIN · Answer

The correct Option is "Add few drops on anhydrous copper sulphate and look for colour change"

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