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`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+)` onlyB. `Fe^(3+), Zn^(2+), Cu^(2+)` onlyC. All but not `Ca^(2+)`D. All |
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Answer» 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] |
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