For the gas phase reaction,

${P C l}_{5 (g)} ⇌ {P C l}_{3 (g)} + {C l}_{2 (g)}$

Which of the following conditions are correct?

△ H < 0 a n d △ S < 0

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△ H > 0 a n d △ S < 0

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△ H = 0 a n d △ S < 0

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△ H > 0 a n d △ S > 0

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Solution

The correct option is D $△ H > 0 a n d △ S > 0$
$P C l_{5} (g) ⇌ P C l_{3} (g) + C l_{2} (g)$

$∙$ Since it is a dissociation reaction, some energy must be given $Δ H > 0$ .

$∙$ Change in gaseous moles is $2 - 1 = 1$ . Therefore, randomness increases as product increases. $Δ S > 0$ .

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