1.

NH_4 CNS can be used to test one or more out of Fe^(3+), Co^(2+), Cu^(2+)e

Answer»

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

Solution :`CoCl_(2)+4NH_(4)CNS OVERSET("ETHER")tounderset("in ethereal layer")underset("Blue colour")((NH_(4))_(2)[Co(CNS)_(4)])+2NH_(4)Cl`
`FeCl_(3) +3NH_(4)CNS to underset("Blood red colour")(Fe(CNS)_(3))+3NH_(4)Cl`


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