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  1. The order of filling of electrons inthe orbitals of an atom will be
  2. The Formation of the oxide ion, O²⁻ from oxygen atom requires first an exothermic
  3. When formaldehyde is polymerised in the presence of dilute H₂SO₄, the compound
  4. A sp³ – hybrid orbital contains
  5. Which electronic configuration of an element has abnormally high difference