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Q. Consider the following chemicals: 1.Benzene 2.Carbon tetrachloride 3.Sodium carbonate 4.Trichloroethylene The chemicals used as dry cleaning agent(s) is/are
  • A. 1, 2, 3 and 4
  • B. 1 only
  • C. 1, 2 and 4 only
  • D. 2 only