Question

Oxidising power of chlorine in aqueous solution can be determined by the parameters indicated below :
`1/2Cl_(2)(g) overset(1/2 Delta_("diss")H^(Θ))(rarr)Cl(g) overset(Delta_(eg)H^(Θ))(rarr)Cl^(-)(g) overset(Delta_("hyd")H^(Θ))(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))^(Θ)=240" kJ mol"^(-1), Delta_("eg") H_(Cl)^(Θ)=-349" kJ mol"^(-1), Delta_("hyd")H_(Cl^(-))^(Θ)=-381" kJ mol"^(-1)`) will be -
A. `-610" kJ mol"^(-1)`
B. `-850" kJ mol"^(-1)`
C. `+ 120" kJ mol"^(-1)`
D. `+ 152" kJ mol"^(-1)`

Answer 1

Correct Answer - A
`DeltaH_(1/2 Cl_(2) rarr Cl^(-))=1/2 DeltaH_("Diss")^(Θ)+Delta_(Eg)H^()+Delta_("hyd")H^(Θ)=1/2 xx240+(-349)+(-381) =-610" kJ/mol"`