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  1. The presence of colloidal particles can be confirmed with the help of
  2. In third group, iron gives blood red colouration with ammonium thiocyanate
  3. Gadolinium belongs to 4f series. Its atomic number is 64
  4. The compound which on reaction with aqueous nitrous acid at low temperature
  5. Biochemical oxygen Demand ,(BOD) is a measure of organic material present in water