Account for the following: Why the acid strengths of halogen acids increase in the order: `HF lt HCl lt Hl` ?

Why the acid strengths of acids increase in the order : HClO lt HClO_2 lt HClO_3 lt HClO_4 ?

How would you account for the following : The acidic strength of compounds increases in the order : PH_3< H_2S

Account for the following order of increasing basicity :

Account for the following: Acidic character increases from HF to HI.

Acidity diprotic acids in aqueous solution increases in the order

Arrange the following in the increasing order of acidic character.