(a) Comment on the fact that HOI disproportionates in aqueous solution at pH 0, but in aqueous HCl at pH 0, iodine(I) is stable with respect to disproportionation.

(b) The solid state structure of [ClF₄][SbF₆] reveals the presence of ions, but asymmetrical Cl—F—Sb bridges result in infinite zigzag chains running through the lattice. The Cl atoms are in pseudo-octahedral environments. Draw the structures of the separate ions present in [ClF₄][SbF₆], and use the structural description to illustrate part of one of the infinite chains.