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  1. The heat of neutralization of a strong base and a strong acid is 57 kJ.
  2. The ozone layer forms naturally by
  3. The electronegativity of the following elements increases in the order.
  4. 6.02 x 10²° molecules of urea are present in 100 mL of its solution
  5. Which of the following statement concerning lanthanides elements is fals