Chemical Bonding And Molecular Structure Question 320

Question: Which one of the following species is diamagnetic in nature [AIEEE 2005]

Options:

A) $ He_2^{+} $

B) H2

C) $ H_2^{+} $

D) $ H_2^{-} $

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Answer:

Correct Answer: B

Solution:

$ \begin{matrix} {} & He_2^{+} & H_2 & H_2^{+} & H_2^{-} \\ \sigma (1s) & \underline{\uparrow \downarrow } & \underline{\uparrow \downarrow } & \underline{\uparrow ,} & \underline{\uparrow \downarrow } \\ \overset{*}{\mathop{\sigma }},(1s) & \underline{\uparrow ,} & \underline{} & \underline{} & \underline{\uparrow ,} \\ B.O. & \frac{1}{2} & 1 & \frac{1}{2} & \frac{1}{2} \\ Magnetic \\ nature \\ & P & D & P & P \\ \end{matrix} $ (P = Paramagnetic, D = Diamagnetic)



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