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Question

Which among the following is not correctly matched with their colour? 
  1. CompoundColourNa4[Fe(CN)5NOS]purple
  2. CompoundColourFe4[Fe(CN)6]3.xH2OCrimson red
  3. CompoundColour[Fe(SCN)]2+Blood red
  4. CompoundColourAgClWhite


Solution

The correct option is B CompoundColourFe4[Fe(CN)6]3.xH2OCrimson red
a.Na2Sfrom sodium extracted+Na2[Fe(CN)5NO]Na4[Fe(CN)5NOS]purple colouration
b.3Fe[(CN)6]44Fe3+Fe4[Fe(CN)6]3.xH2OPrussian blue
c.Fe+3+SCN[Fe(SCN)2+]Ferricthiocynate(Bloodred colouration)
d.Na+Cl−−−FromocNaClAgNO3−−−AgClwhite ppt+NaNO3 

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