Q33 / 120 · JEE Main 2007 · Chemistry

Which of the following species exhibits the diamagnetic behaviour?

  • Correct answer
    A
    $\mathrm{O}_2^{2-}$
  • B
    $\mathrm{O}_2^{+}$
  • C
    $\mathrm{O}_2$
  • D
    $\mathrm{NO}$

Solution

The correct option is $\mathrm{O}_2^{2-}$ This species has $18 \mathrm{~e}^{-}$, which are filled in such a way that all molecular orbitals are fully filled, so diamagnetic. $\mathrm{\sigma 1 s^2 \sigma^* 1 s^2, \sigma 2 s^2 \sigma^* 2 s^2, \sigma 2 p_z^2, \pi 2 p_x^2=\pi 2 p_y^2, \pi^* 2 p_x^2=\pi^* 2 p_y^2}$ Hence, (A) is correct.

Hence, the correct answer is option: 'A'.

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