The decreasing order of stability of O2,O2-,O2+ and O22-is: 

1. O2+>O2>O2->O22-

2. O22->O2->O2>O2+

3. O2>O2+>O22->O2-

4. O2->O22->O2+>O2

Subtopic:  M.O.T |
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NEET - 2015
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A pair in which both species are not likely to exist is:

1. \(H^+_2,He^{2-}_2\) 2. \(H^-_2,He^{2+}_2\)
3. \(H^{2+}_2,He_2\) 4. \(H^+_2,He^{2+}_2\)
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Combination of atoms A and B that forms an anti-bonding molecular orbital is :

1. ΨA2ΨB2

2. ΨA2×ΨB2

3. ΨA+ΨB

4. ΨA-ΨB

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From the perspective of molecular orbital theory, which statement is false?

1. Be2 is not a stable molecule.
2. He2 is not stable but He2+ is expected to exist.
3. Bond strength of N2 is maximum amongst the homonuclear diatomic molecules belonging to the second period.
4. The order of energies of molecular orbitals in N2 molecule is: 

σ2s<σ2s*<σ2pz<(π2pxπ2py)
<(π2px*π2py*)<σ2pz*

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In which of the following ionization processes the bond energy increases and the magnetic behaviour changes from paramagnetic to diamagnetic?
1. \(\mathrm{O_{2}\rightarrow O_{2}^{+} }\)
2. \(\mathrm{C_{2}\rightarrow C_{2}^{+} }\)
3. \(\mathrm{NO\rightarrow NO^{+} }\)
4. \(\mathrm{N_{2}\rightarrow N_{2}^{+} }\)
Subtopic:  M.O.T |
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From NCERT
NEET - 2013
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