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Which of the following statement about Avogadro's hypothesis is correct?

1. Under similar conditions of temperature and pressure, gases react with each other in simple ratio.
2. Under similar conditions of temperature and pressure, equal volumes of all gases contain same number of molecules
3. At NTP all gases contain same number of molecules
4. Gases always react with gases only at the given temperature and pressure

Correct answer: Under similar conditions of temperature and pressure, equal volumes of all gases contain same number of molecules

Solution

Avogadro's hypothesis states that equal volumes of all gases, when measured under the same temperature and pressure, contain the same number of molecules. This is why option B matches the law exactly.

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