The table below shows the colours and solubilities of four solids in water. 
A mixture containing two solids is added to excess water, stirred and filtered.
A blue filtrate and a white residue are obtained. Which two solids are present in the mixture?
(A) W and X (B) W and Y (C) X and Y (D) X and Z
|
Solid |
Colour |
Solubility in water |
|
W |
Blue |
Insoluble |
|
X |
Blue |
Soluble |
|
Y |
White |
Insoluble |
|
Z |
White |
Soluble |