Why does H^+ ion always get associated with other atoms or molecu… - Vidyadip

MCQ

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.
✓
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 can not exist freely.

✓

Answer

Correct option: 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 can not exist freely.

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

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