In the case of hydrides of the oxygen family,which of the following physical properties changes regularly on moving down the group?

$H_2S$ is less acidic than $H_2Te$. Why?

Which of the following compounds has the maximum number of oxo groups $(M=O)$?

Which of the following reactions is $NOT$ given by $SO_2$?

$A$ sulphate of a metal $(A)$ on heating evolves two gases $(B)$ and $(C)$ and an oxide $(D).$ Gas $(B)$ turns $K_2Cr_2O_7$ paper green while gas $(C)$ forms a trimer in which there is no $S-S$ bond. Compound $(D)$ with $HCl$ reacts to form a compound $(E)$ which exists as a dimer. Compounds $(A)$,$(B)$,$(C)$,$(D)$ and $(E)$ are respectively:

Identify the incorrect statement regarding ozone $(O_3)$.