The separation technique that uses the difference in boiling points of liquids is: MCQ with Answer and Explanation

The separation technique that uses the difference in boiling points of liquids is:
A. Magnetic separation
B. Distillation
C. Sublimation
D. Filtration
Answer: Option B
Solution (By JKSSB Mock Tests)
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.

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Question #1
Which bond has the highest ionic character?
A. HI
B. HBr
C. HF
D. HCl

Correct Answer: Option C


Explanation:
Ionic character increases with the difference in electronegativity between bonding atoms. In hydrogen halides, electronegativity decreases from F to I (F: 4.0, Cl: 3.0, Br: 2.8, I: 2.5). Thus HF has the largest electronegativity difference (1.9) and highest ionic character. The trend: HF > HCl > HBr > HI. However, HF is still a covalent polar molecule. Exam tip: Electronegativity difference > 1.7 usually indicates ionic bond.

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Which of the following is used as an antiseptic and bleaching agent?
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Correct Answer: Option D


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Which of the following is a thermoplastic?
A. Polythene
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Correct Answer: Option A


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