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find out total number of coloured/black water insoluble compound(s) from following substances:
`Ag_(2)O,HgI_(2),FeS, Ag_(3)PO_(4),Ba(MnO_(4))_(2),Na_(2)CrO_(4),PbI_(2),AgNO_(2),Ag_(2)C_(2)O_(4)`

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The correct Answer is:
5
`Ag_(2)O,HgI_(2),FeS,Ag_(3)PO_(4),PbI_(2)`
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