The most common oxidation state(s) shown by elements of group 15 is (are) :
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a
-3
b
-3, +5
c
-3, +3, +5
d
+3, +5
answer is C.
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Detailed Solution
The valence shell electronic configurations of VA group elements are ns2 np3. This suggests common oxidation states of VA group elements as +3, +5 and −3.