A few ques

Q3. K4Fe(CN)6 ??

Ans 1) Anhydrous iron(III) chloride may be prepared by union of the elements

2 Fe(s) + 3 Cl₂(g) → 2 FeCl₃(s)

Ans 2) The structure of FeCl₃.6H₂O normally consists of trans [Fe (H₂O) ₄ Cl ₂] Cl . 2 H₂O, though in strong H Cl it forms tetrahedral [ Fe Cl ₄] ^-

tush u r rite...
asish u rong,,

plz answer otehr ques too

good job tushar....you seem to be thorough with inorganic !

Ferrous and Ferric ions maybe distinguished by adding NaOH or NH₄OH to their salt solutions which form green and reddish brown precipitate respectively.
Anhydrous FeCl₃ can be prepared by the direct combination of Fe and Cl₂,as mentioned by Tushar.

Ans 3)
REAGENT NaOH K₄Fe(CN)₆
Fe ²⁺ green ppt White ppt turning blue rapidly

Fe ³⁺ red brown ppt Prussian blue ppt

K₃Fe(CN)₆ KSCN
Turnbull's blue ppt no colour

red brown colour deep red colour
(no ppt)

Q4) - Qualitative Estimation or Quantitative ??
I can tell qualitative, but quantitative....pata nahi...

Qualitatively estimating Fe³⁺ ions....

1) With K₄[Fe(CN)₆] ----> Ferri ferro cyanide (Prussian blue colouration)

2) With CNS^- ------> Fe(CNS)₃ (Red)

3) With CH₃COO^- -----> Fe(CH₃COO)₃ (Blood red)

Ans 3 given is acidified soln of KMnO4

ok..i will give options for Q4 to reduce confusion
a)titrating against acidified KMnO4
b)Titrating against mohr salt soln
c)titrating against oxalic acid soln
d)first reducing ferric ions by stannous chloride and then titrating against a soln of acidified KMnO4