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FILL IN THE BLANKS :

  1. If the ions of group III are precipitated by NH4Cl and NH4OH without prior oxidation by conc.HNO3 _________ is not completely precipitated. 
  2. The soluble Prussian blue has chemical composition ___________ . 
  3. Solution of a salt in conc.HCl is blue, but turns pink on dilution. It indicates the presence of _______ radical. 
  4. Dimethyl glyoxime in alkaline medium is used for the identification of _________ and _________ radicals. 
  5. Manganese ion (Mn2+) gives _____________ coloured borax bead in oxidising flame in cold. 
  6. Ammonium thiocyanate is used in detection of ______________ and ______________ . 
  7. A salt “X” gives apple green colour in Bunsen flame and also gives brown fumes on reaction with dil. H2SO4. The salt “X” is ___________. 

1 Answer

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  1. Fe2+ (ferrous ion) 
  2. KFe[Fe(CN)6]
  3. Cobalt (Co2+
  4. Ni2+, Fe2+ 
  5. Red
  6. Co2+ and Fe3+ or Hg2+ ions
  7. Ba(NO2)2

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