Question 39

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.

Solution

We analyze each statement:

Statement I: For colloidal particles, the values of colligative properties are of small order as compared to values shown by true solutions at the same concentration.

This is TRUE. Colloidal particles are aggregates of many molecules, so the effective number of solute particles is much less than in a true solution of the same concentration. Since colligative properties depend on the number of particles, they are smaller for colloids.

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.

This is TRUE. The zeta potential is defined as the potential difference between the fixed (Stern) layer and the diffused layer of the electrical double layer surrounding a colloidal particle.

Both Statement I and Statement II are true.

The correct answer is Option C: Both Statement I and Statement II are true.

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