Which of the following statements is not correct?

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

The colour of liquid $O_2$ is

In which of the following is there no $S-S$ linkage?

Which of the following ions does not have $S-S$ linkage?

$A$ 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: