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Q.

The formula of ferric ferrous hexacyanate is

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a

Fe3[Fe(CN)6]4

b

Fe4[Fe(CN)6]3

c

Fe3[Fe(CN)6]3

d

Fe3[Fe(CN)6]2

answer is B.

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Detailed Solution

We proceed from left to right, iron (III) means Fe3+, hexacyano means 6CN− ions are present and ferrate (II) means Fe2+ is the central metal atom. 

So, the complex ion is [Fe(CN)6​]4− and the counter ion is Fe3+. So, after balancing the charge, the formula becomes Fe4​[Fe(CN)6​]3​.

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The formula of ferric ferrous hexacyanate is