91Ó°ÊÓ

State whether the following oxides are acidic, basic, neutral, or amphoteric: \(\mathrm{CO}_{2}, \mathrm{P}_{2} \mathrm{O}_{5}, \mathrm{SO}_{3}, \mathrm{MgO}, \mathrm{K}_{2} \mathrm{O}, \mathrm{Al}_{2} \mathrm{O}_{3}, \mathrm{CO}\).

The bond lengths in \(\mathrm{O}_{2}, \mathrm{O}_{2}^{+}\), and \(\mathrm{O}_{2}^{2-}\) are 121,112 , and \(149 \mathrm{pm}\), respectively. Describe the bonding in these molecules in terms of molecular orbital theory and use this description to rationalize the differences in bond lengths.

Correct any inaccuracies in the following statements and, after correction, provide examples to illustrate each statement: (a) Elements in the middle of Group 16 are easier to oxidize to the group oxidation number than are the lightest and heaviest members. (b) In its ground state, \(\mathrm{O}_{2}\) is a triplet and it undergoes Diels- Alder electrophilic attack on dienes. (c) The diffusion of ozone from the stratosphere into the troposphere poses a major environmental problem.

Which of the solvents, ethylenediamine (which is basic and reducing) or \(\mathrm{SO}_{2}\) (which is acidic and oxidizing), might not react with (a) \(\mathrm{Na}_{2} \mathrm{~S}_{4}\), (b) \(\mathrm{K}_{2} \mathrm{Te}_{3}\) ?

Predict whether any of the following will be reduced by thiosulfate ions, \(\mathrm{SeO}_{3}^{2-}\), in acidic conditions: \(\mathrm{VO}^{2+}, \mathrm{Fe}^{3+}, \mathrm{Cu}^{+}, \mathrm{Co}^{3+}\)

\( \mathrm{SF}_{4}\) reacts with \(\mathrm{BF}_{3}\) to form \(\left[\mathrm{SF}_{3}\right]\left[\mathrm{BF}_{4}\right]\). Use VSEPR theory to predict the shapes of the cation and anion.

Predict whether the following species will exhibit inorganic aromaticity: (a) \(\mathrm{S}_{3} \mathrm{~N}_{3}\), (b) \(\mathrm{S}_{4} \mathrm{~N}_{3}^{+}\), (c) \(\mathrm{S}_{5} \mathrm{~N}_{5}\).

Write a comparative account of the properties of sulfuric, selenic, and telluric acids.