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  1. Which of the following has the highest electron affinity?
  2. Copper pyrite, the chief ore of copper, is
  3. 12 g of an alkaline earth metal gives 14.8 g of its nitride .Atomic weight of the
  4. If the melting point of ice is 0⁰C and latent heat of fusion is 5.46 kJ mol⁻¹,
  5. The s-block element used as a catalyst in the manufacture of Buna-S rubber is