When conc. $H_{2}SO_{4}$ is heated with $P_{2}O_{5}$,the acid is converted into

Given below are two statements $:$
Statement $I : H_2Se$ is more acidic than $H_2Te$.
Statement $II : H_2Se$ has higher bond enthalpy for dissociation than $H_2Te$.
In the light of the above statements,choose the correct answer from the options given below.

Which compound of sulfur is used as a refrigerant?

Which of the following ions possesses an $S-O-S$ bond?

How many stages are there in the Contact Process,and what is produced at the end of the Contact Process?

Which one of the following is the correct decreasing order of boiling point?