Answer:
(i) The highest oxidation number
(O.N.) of N is +5 since it has five electrons in the valence shell \[(2\,{{s}^{2}}\,2\,{{p}^{3}})\]and
its minimum O.N. is -3 since it can accept three more electrons to acquire the
nearest inert gas (Ne) configuration.
(ii) Similarly, the highest O.N. of S is
+6 since it has six electrons in the valence shell \[(3\,{{s}^{2}}3\,{{p}^{4}})\]
and its minimum O.N. is -2 since it needs two more electrons to acquire the
nearest inert gas \[(Ar)\] configuration.
(iii) Likewise the maximum O.N.
of \[Cl\] is +7 since it has seven electrons in the valence shell \[(3\,{{s}^{2}}\,3\,{{p}^{5}})\]
and its minimum O.N. is -1 since it needs only one more electron to acquire the
nearest \[(Ar)\] gas configuration.
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