NEET Chemistry: Purification techniques Practice Questions
14 free multiple-choice questions on Purification techniques (PURIFICATION AND CHARACTERISATION OF ORGANIC COMPOUNDS) for NEET Chemistry, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.
Practice thousands more NEET questions in the app →Q1. Which purification technique relies primarily on the difference in boiling points of the components in a liquid mixture?
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Correct answer: B — Distillation
Distillation is the process that separates components based on differences in volatility (boiling points).
Q2. Which purification technique relies on the difference in vapor pressure of components, often using a thermometer to collect the purified component?
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Correct answer: B — Simple Distillation
Simple distillation separates liquids based on differences in boiling points, utilizing the principle of vapor pressure differences.
Q3. When purifying a solution of a sparingly soluble solid, which technique is commonly used to remove the solvent by heating the mixture until the solvent turns into vapor?
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Correct answer: A — Evaporation
Evaporation is used to remove the solvent from a solution by boiling it off, leaving the desired solid residue.
Q4. When a solid substance is heated, the method used to separate a volatile solid from a non-volatile solid by vaporizing the volatile component is called:
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Correct answer: A — Sublimation
Sublimation is the process where a substance changes directly from solid to gas without passing through the liquid state, used for purification.
Q5. When separating a volatile liquid from a non-volatile solid residue, the technique involving heating the mixture and allowing the vapor to condense is called:
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Correct answer: C — Simple Distillation
Simple distillation is the method used to separate liquids from solids by boiling the liquid and collecting the vapor, which condenses upon cooling.
Q6. In the purification of a mixture of two immiscible liquids (like water and oil), the primary separation method employed is based on:
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Correct answer: B — Density differences
Immiscible liquids separate easily based on their density differences, allowing them to be physically separated by decantation or separation funnels.
Q7. Sublimation is a purification technique useful for separating solids when:
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Correct answer: C — The solid can be vaporized easily
Sublimation is effective for purifying solids that can directly change from solid to vapor without passing through the liquid state.
Q8. Which technique is best suited for separating an insoluble solid from a liquid mixture based on density differences?
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Correct answer: B — Filtration
Filtration separates mixtures based on the difference in particle size, allowing an insoluble solid to be retained while the liquid passes through.
Q9. A compound with a low boiling point generally indicates:
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Correct answer: A — Weak intermolecular forces
Lower boiling points imply weaker intermolecular forces between the molecules, making the substance more volatile.
Q10. Crystallization is a method of purification that relies on which property of the substance?
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Correct answer: D — Difference in solubility
Crystallization separates compounds based on differences in their solubility in a given solvent at different temperatures, allowing impurities to be left behind.
Q11. Which technique is used to separate components of a mixture based on their differential partitioning between a stationary phase and a mobile phase?
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Correct answer: D — Chromatography
Chromatography separates components based on their differential partitioning (adsorption/partitioning) between a stationary phase and a mobile phase.
Q12. The melting point of a pure crystalline solid is a characteristic property used for which purpose in organic chemistry?
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Correct answer: B — Confirming purity
The melting point is a fixed, sharp value for a pure substance, which serves as a test for its purity and identity.
Q13. What is the primary goal of purification in organic chemistry?
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Correct answer: B — Obtaining a pure substance
The primary goal of purification is to obtain a compound with the highest possible purity, free from impurities.
Q14. Which purification technique is primarily used to separate a liquid mixture based on differences in boiling points?
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Correct answer: A — Distillation
Distillation is the process of separating liquids based on differences in their boiling points, making it ideal for liquid mixtures.
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