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 :
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.
Solution :
Loss of an electron from $$H$$ atom results in $${H^ + }$$ ion having extremely small size $$\left( { \sim 1.5 \times {{10}^{ - 3}}pm} \right)$$ 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.