NEET-XI-Chemistry
02: Hydrogen
- #7Discuss the consequences of high enthalpy of H-H bond in terms of chemical reactivity of dihydrogen.
Ans : 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.