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If standard heat of dissociation of PCl...

If standard heat of dissociation of `PCl_(5)` is 230 atm cal than slope of the graph of `log k ` vs` (1)/(T) ` is `:`

A

`+50`

B

`-50`

C

`10`

D

None

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Effect of temperature on the equilibrium process analysed by using the thermodynamics From the thermodynamics reaction DeltaG^(@)=-2.30RTlogk DeltaG^(@): Standing free energy change DeltaG^(@)=DeltaH^(@)-TDeltaS^(@) …(ii) DeltaH^(@) : Standard heat of the reaction gt From eqns.(i) and(ii) -2RTlogk=DeltaH^(@)=TDeltaS^(@) DeltaS^(@) : standard entropy change implies" "logK=-(DeltaH^(@))/(2.3RT)+(DeltaS^(@))/(2.3R) Clearly, if a plot of k vs 1/T is made then it is a straight lone having slope =(-DeltaH^(@))/(2.3R) amd y intercept =(DeltaS^(@))/(2.3R) If at temperature T_(1) equilibrium constant be k_(1) and at temperature T_(2) equilibrium constant be k_(2) then : implies" "logK_(1)=-(DeltaH^(@))/(2.3RT_(1))+(DeltaS^(@))/(2.3R) ..(iv) implies" "logK_(2)=-(DeltaH^(@))/(2.3RT_(2))+(DeltaS^(@))/(2.3R) ...(v) Substracting e.q (iv) from (v), we get from the relation we can conclude that the of equilibrium constant increase in temperature for endothermic reaction eith but value of equilibrium constant decrease with the increase in temperature for exothermic reaction If statndard heat of dissociation of PCl_(5) is 230 cal then slope of the graph of log vs (1)/(T) is :

For the Arrhenius equation, the slope for the plot ln k vs 1/T is

A graph plotted between log k vs (1)/(T) is represented by

According to Arrhenius equation, the graph of log_(10) k vs ((1)/(T)) has slope equal to

For a reaction at equilibrium PCl_(5(g)) Leftrightarrow pcL_(3(G))+Cl_(2(g)) , the degree of dissociation of PCl_(5) at 2 atm is 0.02. Then the degree of dissociation at 4 atm is

PCl_(5) on heating dissociates to PCl _(3) and Cl _(3) because :

The plot og log k vs 1//T helps to calculate

The standard enthalpy of atomisation of PCl_(3)(g) is 195" Kcal/mol" . What will be the standard enthalpy of atomisation of PCl_(5)(g) , if the bond dissociation energies of axial P-Cl bonds in PCl_(5)(g) are 10% lesser and the bond dissociation energies of equatorial P-Cl bonds in PCl_(5)(g) are 10% higher than the bond dissociation energies of P-Cl vonds in PCl_(3)(g) .

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