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  1. Gadolinium belongs to 4f series. Its atomic number is 64
  2. The maximum valency of an element with atomic number 7 is
  3. 5 mL of N HCl, 20 mL of N/2 H₂SO₄ and 30 mL of N/3 HNO₃ are mixed together
  4. Alkyl halides react with metallic sodium in the presence of anhydrous ether is
  5. 3-Pentanol upon reaction with PBr₃ gives 2 and 3-bromopentane.Such rearrangement