JEE Main 2017 · 8 Apr · Shift 1 · Chemistry Q41

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ChemistrySingle correct+4 / -1Question 41 of 90

Which of the following is paramagnetic ?

\ce{NO+}

\ce{O2^2-}

\ce{B2}

Answer and worked solution

Official answer: D

$\ce{B2}$ (10 electrons) has one electron in each of the two degenerate π2p orbitals, so it is paramagnetic. $\ce{NO+}$ and CO (14 electrons) and $\ce{O2^2-}$ (18) have all electrons paired.

Topics:Molecular orbital theory

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JEE Main 2017 · 8 Apr · Shift 1, Chemistry question 41