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Chemistry
Chemistry
Problem
Reddish brown (chocolate) precipitate is formed by mixing solutions containing: a.
Cu
2
+
\text{Cu}^{2+}
Cu
2
+
and
[
Fe
(
CN
)
6
]
3
−
[\text{Fe}(\text{CN})_6]^{3-}
[
Fe
(
CN
)
6
]
3
−
ions b.
Cu
2
+
\text{Cu}^{2+}
Cu
2
+
and
[
Fe
(
CN
)
6
]
4
−
[\text{Fe}(\text{CN})_6]^{4-}
[
Fe
(
CN
)
6
]
4
−
ions c.
Pb
2
+
\text{Pb}^{2+}
Pb
2
+
and
SO
4
2
−
\text{SO}_4^{2-}
SO
4
2
−
ions d.
Pb
2
+
\text{Pb}^{2+}
Pb
2
+
and
I
−
\text{I}^-
I
−
ions
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