Qualitative Analysis - Result Question 27

####27. For the given aqueous reaction which of the statement(s) is (are) true? Excess KI+K3[Fe(CN)6] Dilute H2SO4 Brownish-yellow solution

ZnSO4

(White precipitate + Brownish-yellow filtrate)

Na2S2O3  Colourless solution 

(2012)

(a) The first reaction is a redox reaction

(b) White precipitate is Zn3[Fe(CN)6]2

(c) Addition of filtrate to starch solution gives blue colour

(d) White precipitate is soluble in NaOH solution

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Solution:

  1. K3[Fe+3(CN)6]+KI (excess)

K4[Fe+2(CN)6]+KI3( redox ) Brownish yellow   solution 

K4[Fe(CN)6]+ZnSO4K2Zn3[Fe(CN)6]2  or K2Zn[Fe(CN)6]  White ppt 

K2Zn[Fe(CN)6] reacts with NaOH as

K2Zn[Fe(CN)6]+NaOH[Zn(OH)4]2+[Fe(CN)6]4



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