$BF_3$ is used as a catalyst in many industrial processes because of its:

Observe the following molecules/ions: $NH_4^{+}, NH_3, BF_3, OH^{-}, CH_3^{+}, H^{+}, CO, C_2H_4$. The number of Lewis bases in the above list is:

Identify the correct statement$(s)$ from the following:
$a$) Dipole moment of $NH_3$ is more than $NF_3$
$b$) $SF_4$ is square planar
$c$) $SnCl_4$ is more covalent than $SnCl_2$
$d$) $In_2SO_4$ sulphur atom has expanded octet

Which of the following statements are true?

What are the similarities and differences in the Lewis structures of $H_2SO_4$ and $SO_4^{2-}$?

In the following electron dot structure,the correct calculation of the formal charge on the nitrogen atoms from left to right is $\overset{\centerdot \centerdot}{\mathop{N}}\text{=}\mathop{N}\text{=}\overset{\centerdot \centerdot}{\mathop{N}}$