Which statement about the shapes of ions is not correct?
[CoCl$_4$]$^{2–}$ is square planar.
2 )
NH$_4{}^+$ is tetrahedral.
3 )
[Co(H$_2$NCH$_2$CH$_2$NH$_2$)$_3$]$^{2+}$ is octahedral.
4 )
[Co(H$_2$O)$_6$]$^{2+}$ is octahedral.
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