Sodium fusion extract of thiourea is acidified with sulphuric acid and then freshly prepared ferrous sulphate is added. Formula of the red coloured species formed is
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a
Na4Fe(CN)5NOS
b
[Fe(SCN)]+2
c
Fe4Fe(CN)63
d
Fe3Fe(CN)62
answer is B.
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Detailed Solution
Thio urea is Sodium fusion extract contains NaSCNSCN−+Fe+3→[Fe(SCN)]+2 Blood red