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  1. The percentage weight of Zn in white vitriol [ZnSO₄ 7H₂O] is approximately equal
  2. Which of the following protein destroy the antigen when it enters in body call
  3. A hydrocarbon contains 20% hydrogen and 80% carbon.The empirical formula is
  4. Chromatography is a valuable method for the separation, isolation,purification
  5. The number of spherical nodes in 3p orbitals are