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Avogadro's law states that, at constant pressure and temperature, the volume of a gas is directly proportional to which quantity?
AThe mass of one molecule
BThe square of the temperature
CThe pressure of the gas
DThe number of molecules present
Answer & Solution
Correct answer: D. The number of molecules present
1. Avogadro's law fixes pressure and temperature and relates volume to amount of gas.
2. It states $V \propto n$, where $n$ is the number of molecules (or moles).
3. So volume is directly proportional to the number of molecules.
4. Pressure is held constant here, so volume cannot be proportional to it.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 3 Thermal Physics "Avogadro's Law", p.44_
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