Level 3

What is true about the given molecules?

Which of the three molecules, ${\mathrm{H}}_2\mathrm{O}, {\mathrm{SF}}_6$ and ${\mathrm{NH}}_3$, has the minimum ratio of $\frac{\mathrm{x}}{\mathrm{y}}$ (where, $\mathrm{x}$ is the magnitude of a bond angle and $\mathrm{y}$ is the number of lone pairs of electrons in the molecule)?

Which of the following statements is false?

Which of the following is not isostructural with ${\mathrm{SiCl}}_4$?

What is the hybridization of $\mathrm{P}$ in ${\mathrm{PCl}}_5$?

$\mathrm{KF}$ combines with $\mathrm{HF}$ to form ${\mathrm{KHF}}_2$. The compound contains the species 

Which of the following hydrogen bonds are the strongest in vapour phase?

Which acid can combine with its own salt again?