The correct answer is (b) Sulphur in CS₂.
Sulfur dissolves completely in carbon disulfide (CS₂) to form a true solution, not a colloid. In contrast, starch in water, soap solution, and petrol in CS₂ form colloidal dispersions.
Class 9th Science NCERT MCQ Questions
NCERT Books MCQ Questions Session 2024-2025.
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(b) Sulphur forms a true solution in CS2. Others form colloidal solution.
https://www.tiwariacademy.com/ncert-solutions-class-9-science-curiosity-chapter-2/