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

Answer

A

Explanation

Given : `Cl_(2(g))rarr 2Cl_((g)), Delta H=240 kJ mol^(-1)`
`Cl_((g))+e^(-)rarr Cl_((g))^(-) , Delta H=-349 kJ mol^(-1)`
`Cl_((g))^(-)+aq rarr Cl^(-)(aq) , Delta H=-381 kJ mol^(-1)`
then `(1)/(2)Cl_(2(g))rarr Cl^(-)(aq) , Delta H = ?`
`eq(iv)=(1)/(2)xx eq(i)+eq(ii)+eq(iii)`
`Delta H=(1)/(2)xx Delta H_(1)+Delta H_(2)+Delta H_(3)`