Question

Which of the following molecules has a tetrahedral shape?

• A. $HgC{l}_2$
• B. $C{O}_2$
• C. $N{H}_4^{+}$
• D. $Ni(CN{)}_4^{2-}$

Answer 1

The correct option is C $N{H}_4^{+}$

${NH}_4^{+}$ has tetrahedral geometry.

${NH}_4^{+}$ has ${sp}^3$ hybridisation involving one $s$ and three $p$ atomic orbitals, with a bond angle ${109.5}^0$.

${HgCl}_2$ and ${CO}_2$ belongs to $sp$ hybridisation with a linear structure and ${\left[{NiCN}_4\right]}^{2-}$ has ${dsp}^2$ hybridisation with square planar geometry.