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Question:

Decreasing order of stability of O2, O2-, O+2 and O22- is:

O2>O+2>O2−>O22−

O+2>O2>O2−>O22−

O2−>O22−>O+2>O2

O22−>O2−>O2>O+2

Solution:

As the bond order decreases, the stability decreases.
The bond order is
O+2(2.5) > O2(2) > O2-(1.5) > O22-(1).
Decreasing order of stability of O2, O2-, O+2 and O22- is O+2 > O2 > O2- > O22-.
Hence, option B is correct.