Question

Why does $H^{+}$ ion always get associated with other atoms or molecules?

• A. Ionisation 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 or ions. Due to small size it cannot exist free

Answer 1

Answer: (D)

Loss of an electron from hydrogen atom results in a nucleus of very small size as compared to other atoms or ions. Due to small size it cannot exist free

Loss of an electron from H atom results in $H^{+}$ .ion having extremely small size ($-1.5x{10}^{+}pm{)}^{-}$ as compared to normal atomic and ionic size of 50-200 pm. As a consequence, $H^{+}$ does not exist freely and is always associated with other atoms or molecules.