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

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 positiveIn 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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