Oxidising power of chlorine in aqueous solution can be determined by the parameters indicated below
`1/2Cl_2(g)overset(1/2DeltaH_("diss")Cl_2)rarrCl (g) overset(DeltaH_("eg")Cl)rarrCl^(-)(g)overset(DeltaH_("hyd")Cl)rarrCl^(-)(aq)`
The energy involved in the conversion of `1/2Cl_2 (g) " to " Cl^(-) (aq)` (Using the data)
`DeltaH_("diss")Cl_2=240 J mol^(-1)`
`DeltaH_(eg)Cl=-349kJmol^(-1)`
`DeltaH_(hyd)Cl=-318kJ mol ^(-1)`

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)`