$V_2O_5$ is useful as a catalyst in:

The most efficient agent for the absorption of $SO_3$ is

Given below are two statements:
Statement $I$: Oxygen being the first member of group $16$ exhibits only $-2$ oxidation state.
Statement $II$: Down the group $16$ stability of $+4$ oxidation state decreases and $+6$ oxidation state increases.
In the light of the above statements,choose the most appropriate answer from the options given below:

The number of $S=O$ bonds present in sulphurous acid,peroxodisulphuric acid and pyrosulphuric acid,respectively are :

Provide information regarding the ionization enthalpy,electron gain enthalpy,and electronegativity of the elements of Group-$16$.

The final acid product obtained during the synthesis of $H_2SO_4$ by contact process is