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Potassium ferrocyanide is used in the de...

Potassium ferrocyanide is used in the detection of

A

`Cu^(2+)` ions

B

`Fe^(3+)` ions

C

both (a) and (b)

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
C
Both `Cu^(2+)` and `Fe^(3+)` are detected by potassium ferrocyanide
` 2 CuSO_4 + K_4 [Fe (CN)_(6)] to underset("Chocolate ppt.") (Cu_(2) [Fe(CN)_(6)] + 2 K_(2) SO_(4)`
`4 Fe Cl_(3) + 3 K_(4) [Fe (CN)_(6)] to underset("Ferri- ferrocyanide (prussian blue)") (Fe_(4) [Fe (CN)_(6)]_(3)) + 12 KCl`
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