Question

1.HOF, HOCl, HOBr, HOI
2.Cs2O, K2O, TiO, FeO, CO2
arrange them in order of increasing acidic strength and also justify your answer properly

Answer 1

Acidity of Oxy acid (HOCl, HOBr, and HOI) depends on the polarity of the bond. In all three oxy acid, same atom O is attached to H in all acids.

Here, Electronegativity of atom X (F, Cl or Br or I) attached to O decreases down a group, polarity of OH bond decreases, acid strength decreases. It means more the electronegativity of the halogen atom, more the tendency to pull electron and weaker the O-H bond and hence proton (H+) can easily remove.

Example: HOF is strongest acid, HOI is weakest acid (order of acid strength is HOF > HOCl > HOBr > HOI)