Among the following, find the total number of an incorrect statement(s) :

a) ${\mathrm{BO}}_3^{3-},{\mathrm{PO}}_4^{3-},{\mathrm{F}}^{-}$ and ${\mathrm{SiO}}_4^{4-}$ anions are called interfering radicals.

b) ${\mathrm{HgCl}}_2$ reacts with carbonate ion and gives basic mercury (II) carbonate, which does not give a test with bicarbonate.

c) ${\mathrm{SO}}_3^{2-}$ and ${\mathrm{HSO}}_3^{-}$ can be distinguished by the addition of neutral ${\mathrm{H}}_2{\mathrm{O}}_2$ solution against litmus paper.

d) Zinc and sulfuric acid oxidizes sulfite to sulfate

e) oxidize the suspension of sulfite solution to sulfate.

f) Bromine water oxidizes ${\mathrm{BaSO}}_3$ to ${\mathrm{BaSO}}_4$.