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Problem
Copper (II) ions gives reddish brown precipitate with potassium ferrocyanide. The formula of the precipitate is : a.
Cu
4
[
Fe
(
CN
)
6
]
\text{Cu}_4[\text{Fe}(\text{CN})_6]
Cu
4
[
Fe
(
CN
)
6
]
b.
Cu
2
[
Fe
(
CN
)
6
]
\text{Cu}_2[\text{Fe}(\text{CN})_6]
Cu
2
[
Fe
(
CN
)
6
]
c.
Cu
3
[
Fe
(
CN
)
6
]
\text{Cu}_3[\text{Fe}(\text{CN})_6]
Cu
3
[
Fe
(
CN
)
6
]
d.
Cu
3
[
Fe
(
CN
)
6
]
2
\text{Cu}_3[\text{Fe}(\text{CN})_6]_2
Cu
3
[
Fe
(
CN
)
6
]
2
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