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Question
Why does \[\ce{H+}\] ion always get associated with other atoms or molecules?
Options
Ionisation enthalpy of hydrogen resembles that of alkali metals.
Its reactivity is similar to halogens.
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 smal size it cannot exist free.
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Solution
Loss of an electron from hydrogen atom results in a nucleus of very small size as compared to other atoms or ions. Due to smal size it cannot exist free.
Explanation:
Loss of the electron from hydrogen atom results in nucleus size \[\ce{(H+)}\] of 1.5 × 10–3. This is extremely small as compared to normal atomic and ionic sizes of 50 to 200 pm. As a consequence, \[\ce{H+}\] does not exist freely and is always associated with other atoms or molecules.
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