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3. Classification of elements and periodicity in properties — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry3. Classification of elements and periodicity in properties1 Mark
MCQ
The process requiring the absorptionof energy is
  • A
    $F \to {F^ - }$
  • B
    $H \to {H^ - }$
  • C
    $Cl \to {Cl^ - }$
  • ✓
    $O \to {O^ {2-} }$
✓

Answer

Correct option: D.
$O \to {O^ {2-} }$
d
Second electron affinity is zero for an element since already added electron repels existing electrons. Hence, it becomes difficult for an atom to take up another electron.

Therefore, the process $O ^{-} \rightarrow O ^{2-}$ requires energy.

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