The $H_3O^{+}$ ion has the following shape:

What do you understand by bond pairs and lone pairs of electrons? Illustrate by giving one example of each type.

The number of species from the following carrying a single lone pair on the central atom Xenon is $.....$: $XeF_5^{+}, XeO_3, XeO_2F_2, XeF_5^{-}, XeO_3F_2, XeOF_4, XeF_4$

The number of species from the following that have pyramidal geometry around the central atom is . . . . . . . . .
$S_2O_3^{2-}, SO_4^{2-}, SO_3^{2-}, S_2O_7^{2-}$

Which of the following has the maximum bond angle?

Which among the following molecules is not perfectly flat?