a) The acidic character of oxides decreases down the group. As we know N is a non metal and metallic character increases in going down the group. Non metals form acidic oxides whereas metals form basic oxides. Thus, N2O3 is more acidic than Bi2O3.
b) PCl5 has trigonal bipyramidal structure in which 3 equatorial P-Cl bonds are of equivalent length (202 pm) while the 2 axial bonds are longer (240 pm). It is due to the fact that axial bonds suffer more repulsion than equatorial bonds.
c) HF is a weaker acid than HCl in an aqueous solution because HF does not completely dissociate in water due to high electronegativity of F-atom. Whereas HCl dissociates completely in water due to comparatively less electronegativity of Cl than F because of which it is a stronger acid in aqueous solution.
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