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Dalton's law of partial pressures does NOT apply to which of the following gas mixtures at normal temperature?

1. O2 and N2
2. NH3 and HCl
3. He and N2
4. CO2 and O2

Correct answer: NH3 and HCl

Solution

NH3 and HCl react chemically to form solid ammonium chloride, so they cannot coexist as independent gases. Dalton's law applies only to non-reacting gas mixtures.

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