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P Block Elements question

2015 · Q87
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P Block Elements question

2015 · Q87

NEETChemistryP Block ElementsMCQ+4 / −1
The formation of the oxide ion, O2−-−(g) from oxygen atom requires first an exthermic and then an endothermic step as shown below:
O(g) + e−-− →\to→ O−-−(g);  Δ\DeltaΔfHo = −-−141 kJ mol−-−1

O−-−(g) + e−-− →\to→ O2−-−(g);  Δ\DeltaΔfHo = +780 kJ mol−-−1

Thus, process of formation of O2−-− is isoelectronic with neon. It is due to the fact that,
  1. A
    O−-− ion has comparatively smaller size than oxygen atom
  2. B
    oxygen is more electronegative
  3. C
    addition of electron in oxygen results in larger size of the ion
  4. D
    electron repulsion outweighs the stability gained by achieving noble gas configuration.
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