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NH(4)SCN can be used to test one or more...

`NH_(4)SCN` can be used to test one or more out of `Fe^(3+) , Co^(2+) , Cu^(2+)`:

A

`Fe^(3+)` only

B

`Co^(2+), Cu^(2+)` only

C

`Fe^(3+), Cu^(2+)` only

D

All

Text Solution

Verified by Experts

The correct Answer is:
D
`Fe^(3+) +3SCN^(-) to Fe(SCN)_(3)` (deep red colouration)
`Co^(2+) +4SCN^(-) overset("amyl alcohol") to [Co(SCN)_(4)]^(2-)` (blue colouration)
`Cu^(2+) + 2SCN^(-) to Cu(SCN)_(2) darr ("black"),2Cu(SCN)_(2) to 2CuSCN darr ("white")+(SCN)_(2)`
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