The Question is from NEET guide , and it was created by the author Mr. S M HUSSAIN

Question

The anomalous expansion of water refers to its:

Mr. S M HUSSAIN · Accepted Answer

## CORE INFORMATION
✓ **Answer**: A
## CONCEPT FRAMEWORK
 **Primary Concept**: Thermal expansion of water
 **Related Topics**: Density of water, hydrogen bonding
 **Prerequisites**: Understanding of thermal expansion and density.
## SOLUTION PATHWAY
**Given Information**:
The question asks about the anomalous expansion of water.
**Method & Steps**:
1. Understanding Anomalous Expansion:
  Reasoning: Most substances expand when heated and contract when cooled. Water, however, exhibits an unusual behavior between 0°C and 4°C.
  Formula/Rule:  There's no specific formula, but the concept relies on the density changes with temperature.
 2. Analyzing the options:
  Working: Let's examine each option:
  Option A: Increase in volume upon cooling from 4°C to 0°C. This is the definition of anomalous expansion. As water cools from 4°C to 0°C, its volume increases, meaning its density decreases.
  Option B: Decrease in volume upon heating from 0°C to 4°C. This is the opposite of anomalous expansion.
  Option C: Higher density in liquid state compared to solid state. This is true for water, but doesn't directly define anomalous expansion. Ice is less dense than liquid water at 0°C.
  Option D: Lower boiling point compared to other similar molecules. This is not related to anomalous expansion.
 3. Final step:
  Result: Option A correctly describes the anomalous expansion of water.
  Verification: The anomalous expansion of water is a well-established phenomenon, and option A accurately reflects it.
## OPTION ANALYSIS
A ✓:  Correctly identifies the anomalous expansion of water as the increase in volume upon cooling from 4°C to 0°C. This is due to the unique hydrogen bonding structure of water.
B :x: This describes normal thermal expansion, not the anomalous behavior of water.
C :x: While true, this is a consequence of the anomalous expansion, not the definition itself.
D :x: This is unrelated to the thermal properties of water between 0°C and 4°C.
## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing anomalous expansion with normal thermal expansion: Remember that anomalous expansion is a specific exception to the general rule.
  2.Focusing on the density difference between ice and water instead of the behavior between 0°C and 4°C: The anomalous expansion is a specific temperature range.
 **Quick Tips**:
  1.Remember the key temperature range: 0°C to 4°C.
  2.Visualize the density-temperature curve of water to understand the anomaly.

Mr. S M HUSSAIN · Answer

The correct Option is "Increase in volume upon cooling from 4°C to 0°C"

Mr. S M HUSSAIN · Answer

Decrease in volume upon heating from 0°C to 4°C

Mr. S M HUSSAIN · Answer

Higher density in liquid state compared to solid state

Mr. S M HUSSAIN · Answer

Lower boiling point compared to other similar molecules

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