JEE Main 2003 Chemistry question

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

(1) and HCl are formed and the mixture warms up
(2) and HCl are formed and the mixture cools downCorrect
(3) is formed with warming up
(4)The mixture only cools down

Answer: (2)

Solution

Chlorine oxidises phosphine completely; with sufficient chlorine the products are phosphorus pentachloride and hydrogen chloride: PH_3 + 4Cl_2 \to PCl_5 + 3HCl. Option (2) is the only one giving these products and is

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Question ID VK-038190