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Q.

The bond dissociation energies of X2,Y2 and XY are in the ratio of 1:0.5:1.ΔH for the formation of XY is -200 kJ mol-1. The bond dissociation energy of X2 will be

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answer is 3.

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Detailed Solution

LetB.E.of X2,Y2 and XY are x kJ mol-1,0.5x kJ mol-1and x kJ mol-1respectively. 12X2+12Y2→XY;ΔH=-200 kJ mol-1ΔH=Σ( B.E. )Reactant -Σ( B.E. )Product ∴-200=12×(x)+12×(0.5x)-[1×(x)] B.E. of X2=x=800 kJ mol-1
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