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Periodic Table and Periodicity question

2007 · Q94
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Periodic Table and Periodicity question

2007 · Q94

NEETChemistryPeriodic Table and PeriodicityMCQ+4 / −1
Which one of the following ionic species has the greatest proton affinity to form stable compound ?
  1. A
    NH2−_2^ -2−​
  2. B
    F−-−
  3. C
    I−-−
  4. D
    HS−-−
View written solutionFree

Correct answer: A

Going from left to right across a period in the periodic table, the basicity decreases as the electronegativity of the atom possessing the lone pair of electron increases. Hence basicity of NH2−NH_2^-NH2−​ is higher than F-. In moving down a group, as the atomic mass increases, basicity decreases. Hence F- is more basic than I- and HO- is more basic than HS-. Hence among the ionic species, NH2−NH_2^-NH2−​ has maximum proton affinity.

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