The separation technique that uses the difference in boiling points of liquids is:
A. Sublimation
B. Distillation
C. Filtration
D. Magnetic separation
Answer: Option B
Solution (By JKExamLibrary)
Distillation separates liquids based on their different boiling points. The mixture is heated; the component with lower boiling point vaporizes first, is condensed and collected. Fractional distillation is used for smaller boiling point differences. Filtration separates solids from liquids. Sublimation separates sublimable solids. Magnetic separates magnetic substances.
Explanation:
Graphite mixed with clay forms pencil 'lead'. Its layered structure marks paper. Diamond is used in cutting, fullerene in nanotechnology, charcoal in filters and fuel.
Explanation:
After each half-life, half of the remaining atoms decay. Number of half-lives n = total time / half-life = 30/10 = 3. Fraction remaining = (1/2)ⁿ = (1/2)³ = 1/8. Thus 12.5% remains. Radioactive decay follows first-order kinetics. Exam trick: fraction remaining = (0.5)^(t/T), where T is half-life. After 4 half-lives, 1/16 remains.
Explanation:
Iodine sublimes on heating, converting to vapor, leaving sand behind. Iodine vapors can be condensed. Filtration cannot separate two solids; distillation for liquids.
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