Destroyer GC #141

[supera]

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Question is

An ionic solid gave a blue color. Which solid is most likely?

a.BaSO4
b.AgCl
c.CuSO4
d.KI
e.LiSO4

So, the answer is C and the explanation says Color is associated with transition metals. Choice C. But if that's the explanation why not for AgCl? Isn't Ag a transition metal too? Is this a simple memorization that I need to know? or is there are any theory back there that I am not noticing?
Thank you!

 

[Troyvdg]

I don't have destroyer with me, but does it say if its dissolved in water? AgCl isn't soluble

 

[PooyaH]

CuSO4 is soluble and it can break into Cu2+ and SO4--. Copper gives the solution a blue color, whereas SO4-- is colorless. AgCl is insoluble.

 

[supera]

Oh I see, I wasn't thinking of the solubility rule. Thanks! BTW, is there are any other example that gives out color? because I remember another question from this destroyer set stating K2Cr2O7 is expected to be colored