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What identifies a volatile liquid?

Answer and explanation

Correct answer: It easily forms vapour

Direct answer: Option A, it easily forms vapour. Volatility means the tendency of a liquid to change into vapour easily. At the surface of every liquid, some particles have enough energy to escape. In a volatile liquid, intermolecular attraction is relatively weak or the particles escape readily, so evaporation is fast at ordinary conditions. Step by step: liquid particles move; some reach the surface; energetic particles leave; if many leave easily, the liquid is called volatile. A is correct. B is the opposite of volatility: a liquid that never forms vapour is not a normal volatile liquid. C describes a solid, not a liquid, and does not define volatility. D concerns magnetic behaviour, not evaporation; most common liquids do not stick to a magnet. Perfume and petrol are familiar examples because their smell or vapour spreads quickly. Memory cue: volatile means “flies away” as vapour easily.

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ChemistryNature-Of-MatterClass-11

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