Class XI

 Evaporation of solution of CuSO4 helps in
  1. Making it concentrated
  2. Crystallization of CuSO4
  3. Evaporation of salt CuSO4
  4. Both A and B
Biological catalyst to convert Hydrogen Peroxide (H2O2) into water (H2O) and oxygen (O2) is
  1. Amylase
  2. Hydrolase
  3. Catalase
  4. Protease
 Valency of Sulphide is
  1. 1
  2. 2
  3. -1
  4. -2
Distilled water
  1. Has some impurities left in it
  2. Is very pure water
  3. Is obtained through fractional distillation
  4. Is obtained through decanting
Chemical formula of butane is
  1. CH4
  2. C2H4
  3. C3H8
  4. C4H10
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