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Hydrogen — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryHydrogen1 Mark
MCQ
Why does $H^+$ 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 cannot 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 cannot exist freely.
Hydrogen has one electron in its s orbital and it can lose its electron like alkali metals which are highly electropositive in nature for their tendency to lose single electron from its outer shell. So hydrogen is similar to alkali metals. Positive hydride ions react with oxides and hydroxides to form water and with carbonates to form water and carbon dioxide.

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