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

1. 200 kJ mol–1
2. 100 kJ mol–1
3. 800 kJ mol–1
4. 400 kJ mol–1

Subtopic:  Thermochemistry |
From NCERT
NEET - 2018
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