Fill in the blanks choosing appropriate word/words from these given in the brackets :
(increases, decreases, the highest, the lowest, elevation, directly depression, molality, mole fraction, `gt 1, lt 1, DeltaV, DeltaS`, number of solute particles, nature of solute particles, hypotonic, T, `- 3.72^(@)C, -1.86^(@)C`, zero, one, two, more than, less than, 1 kg, 1 mole, molal, same extent, solution, equivalent.)
The van't Hoff factor of NaCl solution is ................ one hence the value of normal colligative property is ....... the observed colligative property of this solution.

Explanation

To solve the question, we need to fill in the blanks with the appropriate words from the options provided. Let's break down the question step by step.

### Step 1: Determine the van't Hoff factor for NaCl
NaCl (sodium chloride) is a strong electrolyte, which means it dissociates completely in solution. When NaCl dissolves in water, it dissociates into two ions:
- Na⁺ (sodium ion)
- Cl⁻ (chloride ion)

Since NaCl dissociates into two particles, the van't Hoff factor (i) for NaCl is:
...