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SSC CGL
mediumQ. No. 14867

Which of the following is a lyophilic colloid?

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Starch sol is a lyophilic colloid. The word lyophilic means “solvent-loving.” In these sols, the dispersed particles have a strong attraction for the dispersion medium. Lyophilic sols form easily, are comparatively stable and can usually be prepared again after the medium is removed, so they are described as reversible. Starch, gelatin, gum and proteins are common examples. Gold sol, sulphur sol and arsenic sulphide sol have little affinity for water and are lyophobic; they need special preparation and are less stable. Therefore, Option C, starch sol, is the correct answer. Concept depth: A lyophilic colloid has strong attraction between its dispersed phase and dispersion medium.

AGold sol
BSulphur sol
CStarch sol
DArsenic sulphide sol
Correct Answer: Starch solYour Answer: C

Explanation

Correct answer: Option C — Starch sol. Starch particles are strongly solvated by water, which makes the sol stable and reversible. Gold sol, sulphur sol and arsenic sulphide sol are standard lyophobic colloids. The deciding factor is the affinity between the dispersed phase and the dispersion medium, not the colour or physical appearance of the sol. Option analysis: Gold sol, sulphur sol and arsenic sulphide sol have little affinity for water, require special preparation methods and are comparatively easy to coagulate; they are lyophobic. Starch molecules interact strongly with water and create a stable hydrated colloidal system, so starch sol is lyophilic.

Important Notes

  • Starch sol is lyophilic because starch strongly interacts with water.
  • Lyophilic sols are generally stable and reversible.
  • Gold, sulphur and arsenic sulphide sols are lyophobic.

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FAQ

SSC CGL Chemistry FAQs

Common questions and clear answers for this topic.

Is starch sol lyophilic or lyophobic?

Starch sol is lyophilic.

What makes a colloid lyophilic?

Its dispersed particles have strong affinity for the dispersion medium.

Why is starch sol stable?

Its particles are strongly hydrated by water.

Are lyophilic sols reversible?

They are generally reversible.

How many chemistry questions typically appear in the SSC CGL exam?

Chemistry usually contributes a handful of questions within the General Awareness section, generally covering basic concepts rather than calculation-heavy problems.

Which chemistry topics are most important for SSC CGL preparation?

Atomic structure, periodic table trends, acids-bases-salts, metals and non-metals, and carbon compounds are the areas that appear most consistently across past papers.

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