What is the correct order of bond angles in $H_2O, NH_3, CH_4, CO_2$?

Which of the following compounds has the smallest bond angle $(X - A - X)$ in each series respectively?
$(A) \ OSF_2 \ \ \ \ \ \ \ \ \ OSCl_2 \ \ \ \ \ \ \ \ \ OSBr_2$
$(B) \ SbCl_3 \ \ \ \ \ \ \ \ \ SbBr_3 \ \ \ \ \ \ \ \ \ SbI_3$
$(C) \ PI_3 \ \ \ \ \ \ \ \ \ \ \ \ AsI_3 \ \ \ \ \ \ \ \ \ \ \ \ SbI_3$

The $H-C-H$,$H-N-H$,and $H-O-H$ bond angles (in $degrees$) in methane,ammonia,and water are respectively,closest to

The number of bonding and non-bonding electron pairs on the $N$ atom in $NO_3^-$ are respectively ..........

The maximum number of lone pairs of electrons on the central atom from the following species is $........$. $ClO_3^-$,$XeF_4$,$SF_4$ and $I_3^-$

Which of the following is not tetrahedral?