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

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The mixture only cools down

PCl3 and HCl are formed and the mixture warms up

PCl5 and HCl are formed and the mixture cools down

PH3 and Cl2 is formed with warming up

answer is B.

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Detailed Solution

PH3+3Cl2→PCl3+3HCl (exothermic) make the solution warm option (c) is not possible because its show the endothermic reaction.

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