Moreover, the salt (A) on heating with solid `K_(2)Cr_(2)O_(7)` and concentrated `H_(2)SO_(4)` produces deep red vapors which dissolve in sodium hydroxide solution forming a yellow solution. This yellow solution gives yellow precipitate with `Ba(NO_(3))_(2)` solution. On the basis of teh aforesaid characteristic informations answer the following questions:
Acidified solution of A, on treatment with KI gives black precipitate F which dissolves in excess of reagent forming the coloured compound G. The chemical composition of F and G are respectively:

Options

A. `HgI_(2)` and `[HgI_(4)]^(2-)`
B. `PbI_(2)` and `[PbI_(4)]^(2-)`
C. `BiI_(3)` and `[BiI_(4)]^(-)`
D. `Cu_(2)I_(2)` and `CuI_(2)`

Answer

C

Explanation