Question

Given below are two statements:
Statement (I): NaCl is added to the ice at \( 0^\circ C \), present in the ice cream box to prevent the melting of ice cream.
Statement (II): On addition of NaCl to ice at \( 0^\circ C \), there is a depression in freezing point.
In the light of the above statements, choose the correct answer from the options given below:

• A. Statement I is false but Statement II is true
• B. Both Statement I and Statement II are true
• C. Statement I is false but Statement II is true
• D. Statement I is true but Statement II is false

Hint:

Freezing point depression occurs when a solute (like NaCl) is added to a solvent (like water), causing the freezing point to lower. This is a colligative property that depends on the concentration of solute particles.

Answer 1

The Correct Option is B

- Statement (I): The addition of NaCl to ice helps lower the freezing point of water, preventing the ice from melting at \( 0^\circ C \) and thus allowing for the ice cream to stay frozen at lower temperatures. This statement is correct. 
- Statement (II): Adding NaCl to ice creates a phenomenon known as freezing point depression, which lowers the freezing point of water and ice. This is a well-known colligative property of solutions. Hence, this statement is also correct. 
Therefore, both statements are true.