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  1. The organic halogen compound used as refrigerent in refrigerators
  2. The indicator used in the titration of iodine against sodium thiosulphate is
  3. The four bonds in methane are directed in space with an angle of
  4. Use of hot air balloons in sports and for meteorological observations is an application
  5. In a lime kiln, to get higher yield of CO₂, the measure that can be taken is