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Q.

Select the Incorrect match

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a

Fe3++Fe(CN)64−→ Blue colour ppt.

b

Fe3++Fe(CN)63−→ Red brown colouration

c

Fe2++Fe(CN)63−→ Blue colour ppt.

d

Fe2++Fe(CN)64−→ Redbrowncolouration

answer is D.

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Detailed Solution

Fe3++Fe(CN)64−→Fe4Fe(CN)22↓ Prussian blue ppt.  (Ferri ferrocyanide)  Fe3++Fe(CN)63−→FeFe(CN)6                                                    Feni fericvaide ' Reddish browi solution  Fe2++Fe(CN)63−→Fe3Fe(CN)62↓                                         Ferro ferricyanide                                            Turnbull's blue ppt. Fe2++Fe(CN)64−→ Fe2Fe(CN)6↓                                                    Ferro ferro cyanide white ppt.
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