Question

In which of the following species the angle around the central atom is exactly equal to ${109}^{\circ }{28}^{\prime }$?

• A. $S{F}_4$
• B. $N{H}_3$
• C. $1N{H}_4^{+}$
• D. None of the above

Answer 1

Answer: (A), (C)

The correct options are
A $S{F}_4$
C $1N{H}_4^{+}$

In ${NH}_4^{+}$, $N$ is $s{p}^3$ hybridised with $4$ bond pairs and $0$ lone pairs making it a perfect tetrahedron.