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$[{(H_{2} O)}_{8} {Fe}_{2} (OH)_{2}] \cdot {({SO}_{4})}_{2}$
Calculate the coordination number of central metal, E.A.N., Primary valencies.
[If the coordination number is 4, EAN is 18 Primary valency =2 than answer is 4182.

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answer is 6343.

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Detailed Solution

Fe-Fe (iron iron) bond is present;

Coordination number of iron (Fe)= 6

$EAN = 26 - 3 + 10 + 1 = 34$

Primary valency of $1 {OH}^{-}, 2 {SO}_{4}^{2 -} = 3$

Hence correct answer is 6343

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