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:

Question

$W$ g of a non-volatile electrolyte solid solute of molar mass $M\,\text{g mol}^{-1}$ when dissolved in $100\,\text{mL}$ water decreases vapour pressure of water from $640\,\text{mm Hg}$ to $600\,\text{mm Hg}$. If aqueous solution of the electrolyte boils at $375\,\text{K}$ and $K_b$ for water is $0.52\,\text{K kg mol}^{-1}$, then the mole fraction of the electrolyte $(x_2)$ in the solution can be expressed as ___.
(Given: density of water $=1\,\text{g mL}^{-1}$, boiling point of water $=373\,\text{K}$)

Answer 1

- Statement (I): The inclusion of NaCl with ice reduces water's freezing point, inhibiting melting at $ 0^\circ C $ and ensuring ice cream remains frozen at lower temperatures. This assertion is accurate.
- Statement (II): The incorporation of NaCl into ice induces freezing point depression, a colligative property that lowers the freezing point of water and ice. This statement is also accurate.
Consequently, both statements are valid.

Show Hint

The Correct Option is B

Solution and Explanation

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