Which is more acidic: `SO_2,SeO_2`, and `TeO_2`?

Find the number of oxide(s) which are more acidic than SO_(3) . SO_(2),Cl_(2)O_(7),P_(2)O_(5),CaO,Al_(2)O_(3)

Arrange the basicity in increasing order of TeO_2 , SO2 and SeO_2

SO_2 is lewis acid ?

Of PH_(3) and H_(2)S which is more acidic and why?

Which is more acidic: a solution of pH=2 or a solution of pH=6?

Of PH_(3) and H_(2)S which is more acidic and why ?

Of PH_(3) and H_(2)S which is more acidic and why ?

Arrange the acids H_2SO_4,H_2SeO_4 and H_2TeO_4 in decreasing order of their strength.