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  1. Use of chlorofluoro carbons is not encouraged because
  2. The strength of H₂O₂ (in g/litre) in 11.2 volume solution of H₂O₂ is
  3. If increase in temperature and volume of an ideal gas is two times, then the initial
  4. The number of significant figures for the three numbers 161 cm, 0.161 cm
  5. When conc. H₂SO₄ is added to dry KNO₃,brown fumes are evolved.These fumes are