1.

Presence of Fe^(3+) ions in FeSO_4 can be checked with

Answer»

BLUE litmus paper
red litmus paper
KCNS solution
None of these

Solution :Only `Fe^(3+)` IONS give blood red COLOURATION with `CNS^(-)` ions.
`Fe^(3+) +3CNS^(-) to UNDERSET("Blood red colouration")(Fe(CNS)_(3))`


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