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  1. Because of lanthanoid contraction,which of the following pairs of elements
  2. The weight of one molecule of a compound C₆₀H₁₂₂ is
  3. The common acid used in the manufacture of rayon and plastics is
  4. Fac-mer isomerism is associated with which one of the following complexes?
  5. Aniline is treated with a mixture of sodium nitrite and hypophosphorus acid,