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Question

Chemistry Question on Methods Of Purification Of Organic Compounds

Red colour complex ion formed on adding FeCl3FeCl_3 to S.E. (sodium extract) when N and S both are present in organic compound is

A

[Fe(CN)6]4−[Fe(CN)_6]^{4-}

B

[Fe(CNS)]2+[Fe(CNS)]^{2+}

C

[Fe(CNS)2]+[Fe(CNS)_2]^+

D

[Fe(CN)6]3−[Fe(CN)_6]^{3-}

Answer

[Fe(CNS)]2+[Fe(CNS)]^{2+}

Explanation

Solution

Na+C+N+S−>[Δ] {Na + C + N + S ->[\Delta]} CH3COOHSodium thiocyanate (In S.E.)\underset{\text{Sodium thiocyanate (In S.E.)}}{ {CH3COOH}} NaCNS+FeCl3−> {NaCNS + FeCl3 ->} + {+} [Fe(CNS)]Cl2Blood red colour\underset{\text{Blood red colour}}{ {[Fe(CNS)]Cl2}} +NaCl {+ NaCl}