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  1. In which of the following pairs of molecules/ions, the central atoms have
  2. When formaldehyde is polymerised in the presence of dilute H₂SO₄, the compound
  3. The number of water molecules in gypsum and in plaster of paris are respectively
  4. How many electrons in an atom with atomic number 105 can have (n + l) = 8
  5. The most stable conformation of n-butane is