Question

Which of the following is correct?

• A. The number of electrons present in the valence shell of $\text{S}$ in $SF_{6}$ is 12
• B. The rates of reactions involving ionic compounds are very slow.
• C. According to VSEPR theory $SnCl_{2}$ is a linear molecule
• D. The correct order of ability to form ionic compounds among $Na^{+},Mg^{2 +}$ and $Al^{3 +}$ is $Al^{3 +}>Mg^{2 +}>Na^{+}$

Answer 1

Answer: (A)

In $SF_{6}$ molecule, there are six bond pairs thus sulphur has 12 valence electrons. Rest other statements are incorrect as ionic reactions are fast, $SnCl_{2}$ is bent and the ability to formed ionic compound is $Al^{3 +} < Mg^{2 +} < Na^{+}$ .