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BITSAT 2013

Exam: BITSAT
Year: 2013
Subject: Chemistry
Chapter: Chemical Bonding and Molecular Structure

BITSAT 2013 · Chemistry · Chemical Bonding and Molecular Structure

Using MOT, which of the following pairs denote paramagnetic species?

Using MOT, which of the following pairs denote paramagnetic species?

Options

A $\mathrm{B}_{2}$ and $\mathrm{C}_{2}$
B $\mathrm{B}_{2}$ and $\mathrm{O}_{2}$
C $\mathrm{N}_{2}$ and $\mathrm{C}_{2}$
D $\mathrm{O}_{2}$ and $\mathrm{O}_{2}^{2-}$

Correct answer

B. $\mathrm{B}_{2}$ and $\mathrm{O}_{2}$

Step-by-step solution

\mathrm{B}_{2}

and

\mathrm{O}_{2}

are paramagnetic due to presence of unpaired electron. MO electronic configuration of

\mathrm{B}_{2}

is:

\sigma1 s^{2}

\sigma^{*}

1 s^{2}

\sigma

2 s^{2}

\sigma^{*}

2 s^{2} \pi2 p_x^{1}=\pi2 p_y^{1} MO electorn i.e. configuration of \mathrm{O}_{2}

is:

\begin{array}{l}\sigma1 s^{2} \sigma^{*}1 s^{2} \sigma2 s^{2} \sigma^{*}2 s^{2} \sigma2 p_z^{2} \pi2 p_x^{2} \\ =\pi2 p_y^{2} \pi* 2 p_x^{1}=\pi* 2 p_y^{1} \end{array}

$

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