Which of the following statements is incorrect?

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Diamagnetic substance sometimes becomes coloured due to HOMO-LUMO transition.

Ionization energy of $O_{2}$ is less than the ionization energy of $N_{2}$ .

$I \cdot E_{1} (O_{2}) < I \cdot E_{1} (O)$

answer is C.

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Detailed Solution

a) No matter if a molecule is diamagnetic or paramagnetic, it has the same colour. The colour is a result of a photon's absorption in the visible portion of the spectrum, which is why. One of the two spin-paired electrons in a diamagnetic molecule can be excited by the photon and moved into a higher energy unfilled orbital, often the lowest unoccupied molecular orbital (LUMO).

b) Since nitrogen has an electrical structure that is only partially filled, it has a higher ionisation energy than oxygen. After losing an electron, oxygen transitions to a half-filled electronic state, which results in less ionisation energy than nitrogen.

d) $I \cdot E_{1} (O_{2}) < I \cdot E_{1} (O)$ is correct.