For the gas-phase decomposition, $P C l_{5} (g) Δ ⇌ P C l_{3} (g) + C l_{2} (g)$ :

Δ H < 0, Δ S < 0

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Δ H > 0, Δ S > 0

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Δ H > 0, Δ S < 0

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Δ H < 0, Δ S > 0

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Solution

The correct option is B $Δ H > 0, Δ S > 0$
In the reaction as one gas reagent convert into 2 gas products. that will increase the entropy of the reaction and it has positive entropy change $Δ S > 0$
And as the heat is absorbed in the reaction, its an endothermic reaction. $Δ H > 0$

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