The values of van’t Hoff factors for KCl, NaCl and K₂SO₄ respectively are .......... .

1.  2, 2 and 2

2.  2, 2 and 3

3.  1, 1 and 2

4.  1, 1 and 1

Three aqueous solutions of NaCl are labelled as ‘A', ‘B’ and ‘C with concentrations 0.1 M, 0.01 M and 0.001 M, respectively. The value of van’t Hoff factor for these solutions will be in the order of -

1. i_A < i_B < i_C

2. i_A > i_B > i_C

3. i_A = i_B = i_C

4. i_A < i_B > i_C

Van't Hoff factor (i) is given by the expression

a. $i=\frac{\text{ Normal molar mass }}{\text{abnormal molar mass.}}$

b. $i=\frac{\text{ Abnormal molar mass }}{\text{normal molar mass. }}$

c. $i=\frac{\text{ Observed colligative property }}{\text{calculated colligative property. }}$

d. $i=\frac{\text{ Calculated colligative property }}{\text{observed colligative property.}}$

The correct choice among the given is-

1. (a, b)

2. (b, c)

3. (c, d)

4. (a, c)