The technique S is distillation. A is the distillation flask, B is the water condenser and C is the conical flask. The separable mixtures are water acetone and water salt because boiling points differ sufficiently.
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Student A has 20 percent sugar, Student B has 16.67 percent and Student C has 27.27 percent by mass. Therefore, Student C has the most concentrated solution because it contains the highest percentage of sugar.
Distillation is suitable because the liquids are miscible and their boiling points differ by 30 °C. The liquid A, having the lower boiling point, vaporises first and is then condensed separately.
Option (iii) is correct. Air with dust particles and starch with water show the Tyndall effect because their dispersed particles scatter light, making the path of the light beam clearly visible to the observer nearby.