(B) The $NO$ molecule has $15$ electrons. According to Molecular Orbital Theory,its electronic configuration is $\sigma 1s^2, \sigma^* 1s^2, \sigma 2s

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(B) The $NO$ molecule has $15$ electrons. According to Molecular Orbital Theory,its electronic configuration is $\sigma 1s^2, \sigma^* 1s^2, \sigma 2s^2, \sigma^* 2s^2, \sigma 2p_z^2, \pi 2p_x^2 = \pi 2p_y^2, \pi^* 2p_x^1$. Since it contains one unpaired electron in the $\pi^*$ orbital,it exhibits paramagnetic behavior.