Reddish brown (chocolate) precipitate is formed by mixing solutions containing:

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Problem

Reddish brown (chocolate) precipitate is formed by mixing solutions containing: (1)

\text{Cu}^{2+}

and

[\text{Fe}(\text{CN})_6]^{3-}

ions (2)

\text{Cu}^{2+}

and

[\text{Fe}(\text{CN})_6]^{4-}

ions (3)

\text{Pb}^{2+}

and

\text{SO}_4^{2-}

ions (4)

\text{Pb}^{2+}

and

\text{I}^-

ions