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  1. Which one of the following is not a sulphide ore
  2. Orthonitrophenol is steam volatile while para-isomer is not. This is because of
  3. Which of the following is the coldest region
  4. The amount of zinc required to produce 224mL of H₂ at STP on treatment with dilute H₂SO₄
  5. The extra amount of energy, which the molecules of the reactants have to absorb