What is expected value of ‘i’ for K4[Fe(CN)6] in dilute solution?

What is expected value of ‘i’ for K4[Fe(CN)6] in dilute solution?
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Ans:- Expected value of n in K4(Fe(CN)6) is 5. 
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A complex compound in which the oxidation number of a metal is zero is - (1) K4 [Fe (CN)6] (2) K3 [Fe (CN)6] (3) [Ni (CO)4] (4) [Pl (NH3)4]Cl2

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Out of NaCl, MgSO4 , Al2 (SO4 ) 3 , K4 [Fe(CN)6 ], which one will bring about the coagulation of a gold sol quickest and in the least of concentration ?

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What would be the equivalent weight of the reductant in the reaction : `[Fe(CN)_(6)]^(-3)+H_(2)O_(2)+2OH^(-)rarr2[Fe(CN)_(6)]^(4-)+2H_(2)O+O_(2)` [Giv

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