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Total number of reagents give below reac...

Total number of reagents give below reacted with `KI_((aq))` to produce `I_(2):`
`CuSO_(4)" "Hg(NO_(3))_(2)`
`"Concentrate"H_(2)SO_(4)"Concentrate"H_(3)PO_(4)`
`KMnO_(4)//H^(+)" "K_(2)Cr_(2)O_(7)//H^(+)`
`Cl_(2)` water acidify bleaching powder
`Pb(NO_(3))_(2)NaNo_(2)+HCl("dil.")`

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The correct Answer is:
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Find total number of reagnets which cann produce I_(2) from KI solution. Conc. H_(2)SO_(4)," "Hg(NO_(3))_(2)"solution, "CuSO_(4)" solution, Conc."H_(3)PO_(4) , K_(2)Cr_(2)O_(7)//H^(+)," "Cl_2" Water, "Pb(CH_(3)COO)_(2)" solution, "Ca(OCl)Cl//H^(+)," "NaNO_(2)+dil.HCl

Pb(NO_(3))_(2)+H_(2)SO_(4) to PbSO_(4)darr+2HNO_(3)

H_(4)underline(P_(2))O_(7)+H_(2)O to 2H_(3)PO_(4)