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  1. The constituents of porland cement are
  2. Benzene is obtained by the fractional distillation of
  3. Oxidation numbers of P in PO₄³⁻, of S in SO₄²⁻ and that of Cr in Cr₂O₇²⁻
  4. The gas molecules have r.m.s. velocity of its molecules as 1000 m/s
  5. Sea weeds are an important source of