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

Mention three areas in which $H_2SO_4$ plays an important role.

$A$ solution of $CrO_5$ in amyl alcohol has a $....$ colour.

Which of the following statements regarding ozone $(O_3)$ is not correct?

When $SO_2$ is passed through acidified $K_2Cr_2O_7$ solution:

Given below are two statements:
Statement $I$: The boiling point of hydrides of Group $16$ elements follows the order
$H_2O > H_2Te > H_2Se > H_2S$.
Statement $II$: On the basis of molecular mass,$H_2O$ is expected to have a lower boiling point than the other members of the group,but due to the presence of extensive $H$-bonding in $H_2O$,it has a higher boiling point.
In the light of the above statements,choose the correct answer from the options given below: