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The complex that dissolves in water is

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$K_{3} [Co {({NO}_{2})}_{6}]$

${Fe}_{4} {[Fe {(CN)}_{6}]}_{3}$

$[{Fe}_{3} {(OH)}_{2} {(OAc)}_{6}] Cl$

${({NH}_{4})}_{3} [As {({Mo}_{3} O_{10})}_{4}]$

answer is A.

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Detailed Solution

$[{Fe}_{3} {(OH)}_{2} {(OAC)}_{6}] Cl \to Red colouration {Fe}_{4} {[Fe {(CN)}_{6}]}_{3} \to Prussian blue precipitate {({NH}_{4})}_{3} [As {({Mo}_{3} O_{10})}_{4}] \to Yellow precipitate K_{3} [Co {({NO}_{2})}_{6}] \to Yellow precipitate$

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