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What may be expected to happen when phosphine gas is mixed with chlorine gas ?

1. PCl3 and HCl are formed and the mixture warms up
2. PCl5 and HCl are formed and the mixture cools down
3. PH3, Cl2 is formed with warming up
4. The mixture only cools down

Correct answer: PCl3 and HCl are formed and the mixture warms up

Solution

Phosphine ignites in chlorine; the reaction PH3 + 3Cl2 -> PCl3 + 3HCl (and further PCl5) is strongly exothermic, so PCl3 and HCl form and the mixture warms up.

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