Oxidising power of chlorine in aqueous solution can be determined by the parameters indicated below
`(1)/(2)CL_(2)(g)overset((1)/(2)Delta_(diss)H^(Theta))(rarr)Cl(g)overset(DeltaH_(Eg)^(Theta))(rarr)`
`Cl^(-)(g)overset(Delta_(hyd)H^(Theta))(rarr)Cl^(-)(aq)`
The energy involved in the conversion of `(1)/(2)Cl_(2)(g)` to
`Cl^(-)(aq)`
(Using the data `Delta_(diss)H_(Cl_(2))^(Theta)=240KJ mol^(-1)`)
`Delta_(Eg)H_(Cl)^(Theta)=-349KJmol^(-1)` ,
`Delta_(Eg)H_(Cl)^(Theta)=-381KJmol^(-1)`) will be

Options

A. `- 850kJ mol^(-1)`
B. `+120kJ mol^(-1)`
C. ` +152kJ mol^(-1)`
D. `- 610 kJmol^(-1)`

Answer

D

Explanation

For the process `(1)/(2) Cl_(2)(g) rarr Cl^(-) (aq) `,using the given steps,
`DeltaH =(1)/(2)Delta_(diss)H_(Cl_(2))+ Delta_(eg) Cl_ +Delta_(hyd) H_(Cl^(-))`
`= ( 240)/(2) - 349-381kJmol^(-1)`
`=120 -730=-610 kJ mol^(-1)`