Question

The particle size of the solute in true solution is:

• A. 1 Å – 10 Å
• B. 10 Å – 100 Å
• C. 100 Å – 1000 Å
• D. More than 1000 Å

Hint:

True solutions have very fine particles, typically in the range of 1 Å to 10 Å, which do not scatter light or settle out.

Answer 1

The Correct Option is A

In the context of chemistry, a true solution is a homogeneous mixture where the solute particles are completely dissolved in the solvent. The size of these particles determines the category into which the solution falls. 

The particle size of the solute in a true solution typically falls within a specific range:

• 1 Å–10 Å (angstroms)

This size range of solute particles ensures they are completely dissolved in the solvent, making the mixture homogeneous at the molecular level. Therefore, the correct option is: 1 Å – 10 Å.

Answer 2

The question asks for the particle size of the solute in a true solution. Check each range against how true solutions actually behave.

1. 1 Å - 10 Å: particles in this range are single ions or molecules, small enough to stay dissolved permanently, pass through any filter, and never scatter light. This is exactly how a true solution behaves.
2. 10 Å - 100 Å: particles this size begin to scatter light and can be held back by fine membranes, which is colloidal behavior, not a true solution's.
3. 100 Å - 1000 Å: this range is still within colloidal territory, well above the size of dissolved ions or molecules.
4. More than 1000 Å: particles this large are visible and settle out, which describes a suspension, not a true solution.

Only the 1 Å - 10 Å range matches the fully dissolved, non-scattering behavior of a true solution.

So the correct answer is 1 Å - 10 Å.