Calculate the total number of spectral lines in balmer series from n1 = 2 and n2 = 5.

Explanation

The order of the acidic strength of oxyacids is as follows : `HClO_(4)` > `HClO_(3)` > `HClO_(2)` > `HClO_(2)`. Acidic strength increases with increase in the oxidation state of central atom.The order can be explained on the basis of stability of the anion fonned after the release of `H^(+)` ion.
`HClO_(4) +H_(2)O rarr ClO_(4)^(-) + H_(3)O^(+)`
`HClO_(3) + H_(2)O rarr CLO_(3)^(-) + H_(3)O^(+)`
`HClO_(2) + H_(2)O rarr ClO_(2)^(-) + H_(3)O^(+)`
`HClO + H_(2)O rarr ClO^(-) H_(3)O^(+)`
Out of `ClO_(4)^(-)`, `ClO_(3)^(-)`, `ClO_(2)^(-)` and `ClO^(-)` , the anion `ClO_(4)^(-)` is most stable. In `ClO_(4)^(-)`, negative charge is dispersed on four electronegative oxygen atoms. Since `ClO_(4)^(-)` is most stable, `HClO_(4)` will be most acidic in nature.