Sulfuric acid has a strong affinity for water because ....

$A$ 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:

Which oxo acid of sulphur contains an $S-O-S$ bond?

The elements with highest and lowest electron gain enthalpy in group $16$ respectively are

Which one of the following statements is not correct?

Identify the element having general electronic configuration $ns^2 np^4$ from the following.