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  1. Which of the following can be termed a phenol formaldehyde resin
  2. Tetraethyl lead is used as
  3. By increasing the temperature , the vapour pressure of a substance
  4. Benzaldehyde condenses with N,N-dimethylaniline in presence of anhydrous ZnCl₂
  5. The percentage weight of Zn in white vitriol [ZnSO₄ 7H₂O] is approximately equal