A) \[BF_{4}^{-}\]
B) \[NH_{4}^{+}\]
C) \[CO_{3}^{2-}\]
D) \[SO_{4}^{2-}\]
Correct Answer: C
Solution :
In \[CO_{3}^{2-}\] ion the \[C-\]atom undergoes\[s{{p}^{2}}-\]hybridisation. It has triangular planar structure. While \[BF_{4}^{-},\,\,NH_{4}^{+}\] and \[SO_{4}^{2-}\] have tetrahedral structure.
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