In a regular octahedral molecule $MX_6$,the number of $X-M-X$ bond angles of $180^{\circ}$ is:

The number of molecules/ions that show linear geometry among the following is $.........$
$SO_2, BeCl_2, CO_2, N_3^{-}, NO_2, F_2O, XeF_2, NO_2^{+}, I_3^{-}, O_3$

Identify the number of molecules in which the central atom has one lone pair of electrons from the following list:
$PbCl_2, PH_3, ClF_3, SF_4, BF_3, SnCl_2$

In the $BrF_3$ molecule,the equatorial lone pairs minimize which of the following?

Which of the following shapes cannot be obtained from trigonal bipyramidal geometry?

Bond angles $104^o$,$117^o$ and $180^o$ are associated with