3 Aqueous copper(II) sulfate solution is placed in an iron container and left to

3 Aqueous copper(II) sulfate solution is placed in an iron container and left to stand for several
days.
Which statement describes what happens?
A Atmospheric oxygen reacts with the copper(II)
sulfate to give black copper(II) oxide.
B Some fine iron particles are formed in the solution.
C The part of the container in contact with the
solution is coated with copper.
D The solution turns from green to blue.