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Dalton's law of partial pressures cannot be applied to which of the following gaseous mixtures at normal temperatures?

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: NH3(g) + HCl(g) -> NH4Cl(s). Since a chemical reaction occurs, the gases do not simply exert independent partial pressures, so Dalton's law cannot be applied.

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