`K_4[Fe(CN)_6]` can be used to detect one or more out of `Fe^(2+),Fe^(3+),Zn^(2+),Ca^(2+)`:

Question

`K_4[Fe(CN)_6]` can be used to detect one or more out of `Fe^(2+),Fe^(3+),Zn^(2+),Ca^(2+)`:

`K_4[Fe(CN)_6]` can be used to detect one or more out of `Fe^(2+),Fe^(3+),Zn^(2+),Ca^(2+)`:
A. `Fe^(2+),Fe^(3+)` only
B. `Fe^(3+), Zn^(2+), Cu^(2+)` only
C. All but not `Ca^(2+)`
D. All

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Correct Answer - D
`Fe^(2+)+2K^(+)[Fe(CN)_6]darr` (white) (in absence of air)
`Fe^(3+)+[Fe(CN)_6]^(4-)toFe_4[Fe(CN)_6]_3`(prussian blue precipitate or solution)
`Zn^(2+)+2K^(+)[Fe(CN)_6]^(4-)`(excess)`toK_2Zn_3[Fe(CN)_6]_2darr`(bluish -white/white)
`Ca^(2+)+2K^(+)[Fe(CN)_6]^(4-)toK_2Ca[Fe(CN)_6]darr`(white)
`Cu^(+)+2K^(+)+[Fe(CN)_6]^(4-)toCu_2[Fe(CN)_6]darr` [chocolate brown]