An aqueous solution of `COCL_2` on addition of excess of concentrated `HCl` turns blue due to formation of

An aqueous solution of CoCl_(2) on addition of excess of conc. HCl turns blue due to formation of

When hydrogen peroxide is shaken with an acidified solution of potassium dichromate in presence of ether, the ethereal layer turns blue due to the formation of

When a small amount of HCl is added to an aqueous solution of BiCl_3 , a white precipitate is formed. This is due to formation of

When a small amount of HCl is added to an aqueous solution of BiCl_3 , a white precipitate is formed. This is due to formation of