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When a reagent (X) reacts with Fe^(3+) s...

When a reagent (X) reacts with `Fe^(3+)` salt solution turnsred due to the formation of a compound (Y). This reagent cause no change in colour with `Fe^(2+)` salt solution. Compound (X) and (Y) are respectively:

A

`NH_(4)SCN and Fe(SCN)_(3)`

B

`K_(4)[Fe(CN)_(6)] and FeSO_(4)`

C

`Na_(2)HPO_(4) and FeSO_(4)`

D

`K_(3)[Fe(CN)_(6)] and K_(2)Fe[Fe(CN)_(6)]`

Text Solution

Verified by Experts

The correct Answer is:
A
`Fe^(3+)+underset((X))(3NH_(4)SCN) to 3NH_(4)^(+) +underset(("blood red colour solution")(Y))(Fe(SCN)_(3))`
`NH_(4)SCN` has no change in colour with `Fe^(2+)`.
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Knowledge Check

  • The reagents X and Y are respectively:

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    B
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    D
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  • When ammonia is added to cupric salt solution, the deep blue colour is observed it is due to the formation of:

    A
    `[Cu(OH)_(4)]^(2-)`
    B
    `[Cu(NH_(3))_(4)]^(2+)`
    C
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    B
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    C
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    D
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