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  1. The screening effect of d-electrons is
  2. Boron is unable to form BF₆³⁻ because of
  3. One litre hard water contains 12 mg Mg²⁺. Milli equivalents of washing soda
  4. The trivial names of propanone and 3-methyl-2-butanone are
  5. The main constituent of a natural gas is