insoluble-strong electrolyte??why??

[sony102]

how can insoluble ionic compounds be strong electrolytes? electrolyts must produce ions in aquous solution and conduct electricity, without being soluble you can't produce ions or conduct electricity, why do we still call insoluble ionic compounds strong electrolytes??? I don't get it
please hellllllllllp

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[Tina324]

hey sony,

can u give us an example?

 

[sony102]

according to this question from princeton review MCAT:

which is the weakest electrolyte?
a) NH4I
b)LiF
c) AgBr
d)H2O2

the correct ansr is D but it also says in the explanation "All ionic compounds, whether soluble or not, are defined as strong electrolytes so choices A,B,C are eliminated.
it's this explanation that confuses me AgBr is insoluble, how can it be a strong electrolye???

 

[jdent]

Im with you, unless the ionic compound is soluble its not an electrolyte.