A black precipitate is obtained when H2S is passed through a dilute acidic (HCI) aqueous solution containing

In qualitative analysis, a black precipitate is obtained when H_(2)S is passed through an acidified aqueous solution of a salt . A blue coloured solution is obtained on boiling the preciptate with dilute HNO_(3) . The substance obtained on addition of excess of ammonia solution to this blue solution is -

Write down the formula of the black precipitate formed when H_2S gas is passed through an aqueous solution of lead nitrate?

An aqueous solution of a substance, on treatment with dilute HCl, gives a white precipitate soluble in hot water. When H_(2)S is passed through the hot acidic solution, a black precipitate is formed. The substance is:

An aqueous solution of a substance, on treatment with dilute HCl, gives a white precipitate soluble in hot water. When H_(2)S is passed through the hot acidic solution, a black precipitate is formed. The substance is:

The metallic sulphide not precipitated if H_2S gas is passed through HCl containing aqueous solution is:

What is the coordination entity formed when excess of aqueous KCN is added to the aqueous solution of copper sulphate? Why is it that no precipitate of copper sulphide is obtained when H_2S (g) is passed through this solution .

What is the co-ordination entity formed when excess of aqueous KCN is added to an aqueous solution of copper sulphate ? Why is that no precipitate of copper sulphide is obtained when H_2 S(g) is passed through this solution ?