Correct Answer: Option C

Explanation

The oxidation number of Al = +3 , O = - 2, N =?  in Al(NO\(_3\) )\(_3\)

                            Al(NO\(_3\) )\(_3\) = 0

                            Al + 3N + 3(O3) = 0

                            +3 + 3N + 3(-2 X 3) = 0

                                3N = 18 - 3

                                N = 15/3

                                N = + 5 - Option C

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