Verified Solution • 2025–26 Session moderate

QJEEM21Chc52f: JEE Main 2021 Chemistry - Class 11 JEEM21Chc52f Solution: The bond order and magnetic behaviour of ion are respectively :

The bond order and magnetic behaviour of O2−O_2^ - ion are respectively :

Multiple Choice Options

  • A 1.5 and paramagnetic
  • B 1.5 and diamagnetic
  • C 2 and diamagnetic
  • D 1 and paramagnetic

Step-by-Step Verified Solution

O2−=(σ1s)2(σ1s∗)2(σ2s)2(σ2s∗)2(σ2pz)2O_2^ - = {({\sigma _{1s}})^2}{(\sigma _{1s}^*)^2}{({\sigma _{2s}})^2}{(\sigma _{2s}^*)^2}{({\sigma _{2{p_z}}})^2} (π2px2=π2py2)(π2px∗2=π2py∗1)\left( {\pi _{2{p_x}}^2 = \pi _{2{p_y}}^2} \right)\left( {\pi _{2{p_x}}^{*2} = \pi _{2{p_y}}^{*1}} \right)

Bond order = 10−72=1.5{{10 - 7} \over 2} = 1.5

and paramagnetic.

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