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 every 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 every small size as compared to other atoms or ions. Due to small size it cannot exist free.

Answer 2

: Loss of an electron from H atom results in $H^{+}$ion having extremely small size $(\sim 1.5 \times 10^{- 3}Pm)$ as compared to normal atomic and ionic sizes of 50-200 pm. As a consequence. $H^{+}$does not exist freely and is always associated with other atoms or molecules.