First slide

Qualitative analysis

Question

Which of the following reagent can be used to distinguish ${Cu}^{2 +}; â {Cd}^{2 +}$ and ${Bi}^{3 +}$

Moderate

A

Dilute HCl
B

H₂S gas in the presence of HCl
C

${NH}_{4} OH + {({NH}_{4})}_{2} {SO}_{4}$
D

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

Solution

$K_{4} [Fe {(CN)}_{6}] \overset{{Cu}^{2 +}}{â} {Cu}_{2} [Fe {(CN)}_{6}]$
Chocolate Brown
$K_{4} [Fe {(CN)}_{6}] + {Cd}^{2 +} â {Cd}_{2} [Fe {(CN)}_{6}] + 4 K^{+ 1}$
Greenish white
$K_{4} [Fe {(CN)}_{6}] + {Bi}^{3 +} â$ No reaction

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