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MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryThermodynamics and ThermochemistryPrevious Year Questions

If the bond energies of H–H, Br–Br, and H–Br are 433, 192 and 364 kJ mol–1 respectively, the H for the reaction 2(g) 2(g) (g) H Br 2HBr → is (2004)

A.–261 kJ
B.+103 kJ
C.+261 kJ
D.–103 kJ✓ Correct
Explanation

H H Br Br 2H Br 433 192 2 364 625 728 Enegy absorbed energy released → x Net energy released = 728 – 625 = 103 kJ i.e., H 103kJ

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