4 D is a green crystalline solid that dissolves in water to give a very pale
green solution. Addition of sodium hydroxide solution to a solution of D
produces a green precipitate, E, which turns orange-brown around the top
after standing in air. Addition of dilute hydrochloric acid and barium chloride
solution to a solution of D gives a white precipitate, F.
a State the names of D, E and F.
b Write equations (full or ionic) for the reactions producing E and F.