1.

Fe^(2+) does not givebluecolour with K_(4)[Fe(CN)_(6)] but onitsreaction with (X) ,bluecolour oppears (X) can be

Answer»

`MnO_(4)^(THETA) //H^(o+)`
`H_(2)SO_(4)`
`NH_(3)`
`HCI`

Answer :a


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