Colour of the solution when KI reacts with `Br_(2)` is

Colour of ppt formed when HgCl_(2) reacts with KI is

When SO_(2) gas is allowed to react with acidified potassium dichromate solution , the yellow colour of the solution changes to green. This is due to the formation of

Which is the major product when propane is reacted with Br_(2) in the presence of light

A metal nitrate reacts with KI solution to give a block precipitate which on addition of excess of KI solution forms an orange coloured solution. The cation of metal nitrate is :

A metal nitrate reacts with KI solution to give a black precipitate which on addition of excess of KI solution forms an orange coloured solution. The cation of metal nitrate is :