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# Which of the following is not tetrahedral ?

$\begin {array} {1 1} (a)\;BF_4^{-} & \quad (b)\;NH_4^{+} \\ (c)\;CO^{2-}_{3} & \quad (d)\;SO_4^{2-} \end {array}$

Can you answer this question?

(c) $CO_3^{2-}$
answered Nov 7, 2013 by