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Question

For the gas-phase decomposition ,
$$PCI_{ 5 }\left( g \right) \begin{matrix} \triangle  \ \rightleftharpoons  \end{matrix}PCI_{ 3 }\left( g \right) +CI_{ 2 }\left( g \right)$$:


A
H<0,S<0
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B
H>0,S>0
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C
H>0,S<0
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D
H<0,S>0
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Solution

The correct option is B $$\triangle H>0,\triangle S>0$$
Given reaction is the decomposition reaction of $$PCl_5$$.
Usually, all the decomposition reactions are endothermic, heat energy is absorbed during the reaction. Hence enthalpy of the reaction is positive.
$$\Delta H> 0$$ or positive

In the reaction, 1 mol of $$PCl_5$$ gives the 2 mol of gaseous product. This means that there is an increase in randomness or the entropy of the reaction. Hence we can say that $$\Delta S >0$$ or positive.

Chemistry

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