# NEET Chemistry The p-Block Elements (XII) Questions Solved

BOARD

Give reasons for the following:

(i) Though nitrogen exhibits +5 oxidation state, it does not form pentahalide.

(ii) Electron gain enthalpy with negative sign of fluorine is less than that of chlorine.

(iii) The two oxygen-oxygen bond lengths in ozone molecule are identical.

(i) Due to absence of empty d-orbitals, ${N}_{2}$ does not form pentahalide.

(ii) Because of small size of flourine atom and strong electron-electron repulsions in its compact 2p orbitals.

(iii) Due to resonance the two oxygen atoms have partial double bond character and thus have same bond length i.e. 128 pm

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