List of top Chemistry Questions on Chemical bonding and molecular structure asked in KCET

With respect to resonance structures of CO\(_3\)\(^{2-}\) ion, which of the following statements are correct?
(a) All C-O bonds in CO\(_3\)\(^{2-}\) are equivalent
(b) There are three resonance structures possible for CO\(_3\)\(^{2-}\) ion
(c) The position of carbon and oxygen should change in every resonance structure
(d) The formal charge on carbon atom is -2

In which of the following option/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\(_4\) (Bond angle)
(c) NH\(_3\)<H\(_2\)O<HF (Strength of intermolecular hydrogen bonding)
(d) H - I>H - Br>H – Cl (Bond length)