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Oxygen differs from the other elements of the group. Compounds of oxygen with metals are more ionic in nature and hydrogen bonding is more important for P oxygen compounds. Oxygen is never more than divalent because when it has formed two covalent bonds, there W. are no low energy orbitals which can be used to form further bonds. However, the elements S, Se, Te and Po have empty d-erbitals which may be used for bonding, and they can form four or six bonds by unpairing electrons. The bigher oxidation states become less stable on descending the group.
The bond berween \( \mathrm{S} \) and \( \mathrm{O} \), or \( \mathrm{Se} \) and \( \mathrm{O} \), are much shorter than might be expected for a single bond owing to \( p \pi-d \pi \) interaction between the \( p \)-orbital of oxygen and \( d \) - orbital of \( S \) or \( S e \).
Which of the following statement is incorreet?
(A) Oxo-anions of sulphur have little tendency to polymerise compared with the phosphates and silicates.
(B) In pyrosulphurous acid \( \left(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{5}\right) \), the oxidation states of both the sulphur atoms are not same, they are \( +\mathrm{V} \) and \( + \) III
(C) Concentrated HNO, oxidises both sulphur and selenium to \( \mathrm{H}_{2} \mathrm{SO}_{4}(+\mathrm{VI}) \) and \( \mathrm{H}_{2} \mathrm{SeO}_{4}(+\mathrm{VI}) \) respectively.
(D) Moet metal oxides are ionic and basic in nature while non-metallic oxides are usually covalent and acidic in nature.
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