Oxidising power of chlorine in aqueous solution can be determined by the parameters indicated below: 12Cl2(g)→12ΔdissHoCl(g)→ΔegHoCl−(g)→ΔhydHoCl−(aq)The energy involved in the conversion of 12Cl2(g) to Cl−1(aq)(using the data, ΔdissHCl− =+240 kJ mol−1, ΔegHCl- =−349 kJ mol−1, ΔhydHCl− =−381 kJ mol−1) will be:
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a
+152 kJ mol−1
b
−610 kJ mol−1
c
−850 kJ mol−1
d
+120 kJ mol−1
answer is B.
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Detailed Solution
For the process, 12Cl2(g)→Cl−(aq); ΔH=?12Cl2(g)→Cl(g), ΔdissHClΦ=240 kJ mol−1Cl(g)+e−→Cl−(g); ΔegHClΦ=−349 kJ mol−1Cl−(g)+aq.→Cl−(aq); ΔhydHClΦ=−381 kJ mol−1¯ΔH=ΔdissHCl2Φ2+ΔegHClΦ+ΔhydHCl−Φ=2402+(−349)+(−381)=−610 kJ mol−1