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  1. Which of the following statement concerning lanthanides elements is fals
  2. Haemoglobin is a complex of
  3. In hydrogen spectrum, the different line of Lyman series are present in
  4. What is the value of electron gain enthalpy of Na+ if IE₁ of Na =5.1 eV ?
  5. Property of the alkaline earth metals that increases with their atomic number