NEET 2011 Chemistry question

Chemistry Thermodynamics NEET 2011

Enthalpy change for the reaction, is .

The dissociation energy of H-H bond is :

(1)
(2)
(3)Correct
(4)

Answer: (3)

Solution

The reaction forms two H-H bonds from four atoms, releasing . Reversing gives , for breaking two moles of H-H bonds. The

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Question ID VK-090813