At room temperature and pressure, kinetic energy of the particles are minimum in case of:
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. iron.
At room temperature and pressure, the kinetic energy of particles depends on their state of matter. Gases have the highest kinetic energy, followed by liquids, and then solids have the lowest. Among the given options:
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Iron is a solid at room temperature.
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Methane is a gas.
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Kerosene and water are liquids.
Since solids have tightly packed particles that vibrate in fixed positions, their kinetic energy is significantly less than that of liquids or gases. Therefore, iron, being a solid, has the minimum kinetic energy among the options listed.
This principle is based on the kinetic molecular theory, which explains that temperature affects the movement of particles, and gases move the most freely.