Question

b. (b)Only Zn(OH)2
9. (i) Identify the substances P.Q and Rin each case based in the information given below: (3 marks)
a. The delinquent salt P, turns yellow on dissolving in water, and gives a reddish brown precipitate with
NaOH solution
b. The White crystalline solid Q is soluble in water. It liberates a pungent smelling gas when heated with
sodium hydroxide solution
c. The pale green solid R turns reddish brown on heating. Its aqueous solution gives a white precipitate
with barium chloride solution. The precipitate is soluble in mineral acids.
(2 marks)
(ii)Why does the blue precipitate of Cu(OH)2 turn black on heating?​

Answer 1

Answer:

Explanation:

a .  iron III chloride  FeCl3