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Question
Atomic hydrogen combines with almost all elements but molecular hydrogen does not. Explain.
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Solution
Atomic hydrogen is highly reactive, whereas molecular hydrogen is rather inert. Bond dissociation enthalpy determines the chemical behaviour of dihydrogen (and, for that matter, any molecule) to a great extent. For a single bond between two atoms of any element, the \[\ce{H - H}\] bond dissociation enthalpy is the highest. As a result, molecular hydrogen reacts only with a few elements.
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Choose the most appropriate answer from the options given below:
