Statement I: For colloidal particles, the values of colligative properties are of small order as compared to values shown by true solutions at same concentration.
Statement II : For colloidal particles, the potential difference between the fixed layer and the diffused layer of same charges is called the electrokinetic potential or zeta potential.
In the light of the above statements, choose the correct answer from the options given below.
Statement II : For colloidal particles, the potential difference between the fixed layer and the diffused layer of same charges is called the electrokinetic potential or zeta potential.
In the light of the above statements, choose the correct answer from the options given below.
- (A)Statement I is true but Statement II is false
- (B)Statement I is false but Statement II is true
- (C)Both Statement I and Statement II are true✓ Correct
- (D)Both Statement I and Statement II are false
Answer: (C)
Solution
Statement I is true: colloidal particles are large aggregates, so for a given mass concentration the number of particles is small; since colligative properties depend only on particle number, their magnitudes are much smaller than for a true solution of the same concentration. Statement II is true: the potential difference between the fixed (adsorbed) layer and the surrounding diffuse layer of a charged colloidal particle is the electrokinetic (zeta) potential. Both statements are true.
JEE Main · 2023 · 24 Jan 2023 · Shift 1 · Single correct option