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Discuss the Consequences of High Enthalpy of H–H Bond in Terms of Chemical Reactivity of Dihydrogen. - Chemistry

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ConceptDihydrogen

Question

Discuss the consequences of high enthalpy of H–H bond in terms of chemical reactivity of dihydrogen.

Solution 1

The ionization enthalpy of H–H bond is very high (1312 kJ mol–1). This indicates that hydrogen has a low tendency to form H+ ions. Its ionization enthalpy value is comparable to that of halogens. Hence, it forms diatomic molecules (H2), hydrides with elements, and a large number of covalent bonds.

Since ionization enthalpy is very high, hydrogen does not possess metallic characteristics (lustre, ductility, etc.) like metals.

Solution 2

This is due to its small atomic size and also small bond length (74 pm) of H-H bond.

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Solution Discuss the Consequences of High Enthalpy of H–H Bond in Terms of Chemical Reactivity of Dihydrogen. Concept: Dihydrogen.
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