Iodine dissolves readily in

A light green coloured salt soluble in water gives black percipitate on passing H_(2)S which dissolves readily in HCl. The metal ion present is :

A light green coloured salt soluble in water gives black percipitate on passing H_(2)S which dissolves readily in HCl. The metal ion present is :

A light green coloured salt soluble in water gives black precipitate on passing H_(2)S which dissolves readily in HCl. The metal ion present is :

Silica dissolves readily in

Lead dissolves most readily in