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How do particles of a solid move?

Answer and explanation

Correct answer: They vibrate about fixed positions

The governing concept is the kinetic-particle model of solids. In a solid, particles are held by strong attractive forces in an orderly arrangement. They cannot normally travel freely from one place to another, but they continuously vibrate about their mean or fixed positions because they possess thermal energy. The amplitude of this vibration generally increases when temperature rises, while the solid still retains its overall shape. Thus option A is correct. Option B describes neither normal solid motion nor the effect of confinement. Option C violates conservation of matter, since particles do not simply disappear. Option D is also incorrect because the vibrations occur in different directions, not only upward. Fixed positions do not mean complete absence of motion.

Related tags

ChemistryNature-Of-MatterClass-11Nature Of MatterSome Basic Concepts Of ChemistryClass 11 Mcq

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