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7) A flow chart for the procedure follows. From step1 O NHa AI(OH)3, Fe(OH)s Zn(NH) and
Group IIl Cations 7 NaOH TO HCI+ thioacetaide Fe(OH)3 ZnS Al(OH,- Group IlI lons : white 8
OHCI+ aluminon Fe3 Al* NH3 9 Al(OH)s red lake 8 KSCN FeSCN2 blood-red
Solution
3. A. Definitely present- Fe 3+
ion.( as red ppt of FeSCN 2+
formed)
B. Definitely Absent- Zn 2+
( filtrate gives no white ppt on adding Sulphide ion)
C. Possibly present - Al 3+
(as some amount of the ppt is soluble in NaOH)
4. A. Definitely present - none ( no confirmatory test for Zn ion has done)
B. Definitely Absent - Al 3+
, Fe 3+
( no ppt is formed)
C. Possibly present - Zn 2+
(the sample is soluble in Ammonia)

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