What is the bond angle of $H-O-H$ in $H_2O$ (in $^\circ$)?

Which of the following pairs are isostructural?

Which of the following pairs of compounds consists of an equal number of lone pairs of electrons in the valence shell of the central atom?

Which set of the following molecules has only one lone pair of electrons on their respective central atoms?
$(i)$ $SO_2$
$(ii)$ $XeF_4$
$(iii)$ $PbCl_2$
$(iv)$ $SF_4$
$(v)$ $ClF_3$

The incorrect geometry is represented by

The correct order of the bond angles of the compounds $SiCl_4, BF_3, BeCl_2$ and $SF_6$ is