Question

Ice floats on water because:

• A. its density is less than that of water
• B. crystal structure of ice has empty space
• C. both of the above
• D. none of the above

Hint:

Ice floats because hydrogen bonding creates an open structure → larger volume → lower density.

Answer 1

The Correct Option is C

Concept: A substance floats on another if its density is lower.

Step 1: Density comparison \[ \text{Density of ice}<\text{Density of water} \] Hence, ice floats.

Step 2: Reason for lower density Ice has an open hexagonal crystal structure due to hydrogen bonding:
• Molecules are arranged with empty spaces (cavities)
• Volume increases
• Density decreases

Step 3: Conclusion
• Statement (A) is correct (fact)
• Statement (B) explains the reason \[ \Rightarrow \text{Both are correct} \] Final Answer: C