The bond length of $C-F$ in $CH_3F$ molecule is (in $pm$)

Which of the following species exists?

What are the different types of bonds formed by sulphur with oxygen in thiosulfuric acid $(H_2S_2O_3)$?

In which of the following options, the order of arrangement does not agree with the variation of property indicated against it?
$(a)$ $BF_3 < NF_3 < NH_3$ (Dipole moment)
$(b)$ $HgCl_2 > NH_4^+ > SF_6$ (Bond angle)

Match List-$I$ with List-$II$ :

List-$I$ (Molecule Species)	List-$II$ (Property/Shape)
$A$. $SO_2Cl_2$	$I$. Paramagnetic
$B$. $NO$	$II$. Diamagnetic
$C$. $NO_2^-$	$III$. Tetrahedral
$D$. $I_3^-$	$IV$. Linear

Choose the correct answer from the options given below :

Some of the properties of the two species,$NO_{3}^{-}$ and $H_{3}O^{+}$ are described below. Which one of them is correct?