The value of `K_(f)`for water is `1.86^(@)`, calculated from glucose solution, The value of `K_(f)`for water calculated for NaCl solution will be,

Options

A. `=1.86`
B. `lt1.86`
C. `gt1.86`
D. Zero

Explanation

To solve the question regarding the value of \( K_f \) for water when calculated from a NaCl solution, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding \( K_f \)**:
- \( K_f \) is the freezing point depression constant, which is a property of the solvent (in this case, water) and does not change with the solute used.

2. **Given Value of \( K_f \)**:
- We are given that the value of \( K_f \) for water calculated from a glucose solution is \( 1.86 \, ^\circ C \).

3. **Effect of Solute on \( K_f \)**:
- The value of \( K_f \) is a constant for a specific solvent. It does not depend on the type of solute (like glucose or NaCl) that is dissolved in the solvent.

4. **Conclusion**:
- Since \( K_f \) is a property of the solvent (water), regardless of whether we use glucose or NaCl, the value of \( K_f \) for water remains the same.
- Therefore, the value of \( K_f \) for water calculated from a NaCl solution will also be \( 1.86 \, ^\circ C \).

5. **Final Answer**:
- The value of \( K_f \) for water calculated for NaCl solution will be \( 1.86 \, ^\circ C \).