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Select the correct statement about elements of group 15:
(a) The order of stability of oxidation state for \( +3 \) is \( \mathrm{Bi}^{3+}\mathrm{Sb}^{3+} \) and for \( +5 \) is \( \mathrm{Bi}^{5+}\mathrm{Sb}^{5+}\mathrm{As}^{5+} \)
(b) In the case of nitrogen, all oxidation states from \( +1 \) to \( +4 \) tend to disproportionate in acid solution.
(c) There is a considerable increase in covalent radius from \( \mathrm{N} \) to \( \mathrm{P} \) but from \( \mathrm{As} \) to \( \mathrm{Bi} \) only a small increase in covalent radius is observed.
(d) All of these
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