question_answer 42)

  Why does \[{{H}^{+}}\] ion always get associated with other atoms or molecules? (a) lonisation enthalpy of hydrogen resembles that of alkali metals (b) Its reactivity is similar to halogens (c) It resembles both alkali metals and halogens (d) Loss of an electron from hydrogen atom results in a nucleus of very small size as compared to other atoms orions. Due to small size it cannot exist free

Answer:

  (d)\[H\to {{H}^{+}}+e.{{H}^{+}}\]has a very small size ; \[(-1.5\times {{10}^{-3}}pm)\]compared to normal atomic and ionic sizes of 50 to 220 pm. It does not exist freely and is always associated with other atoms or molecules.