MHT CET · Chemistry · Surface Chemistry

What type of colloid is the soap lather?

A Solid sol
B Emulsion
C Foam
D Aerosol

Verified Solution

Answer & Solution

Correct Answer

(C) Foam

Step-by-step Solution

Detailed explanation

Soap lather forms colloidal foam in which gas is dispersed in liquid medium.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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