Class XI

In order to separate colors, dyes and amino acids, useful method will be
  1. crystallization
  2. centrifugation
  3. filtration
  4. chromatography
Presence of pesticides and herbicides can be tested through
  1. careful distillation
  2. decanting
  3. boiling points
  4. chromatographs
Factors affecting speed of chemical reactions does not include
  1. Pressure on reactants
  2. Particle size of reactants
  3. Concentration of reactants
  4. Volume of reactants
Physical properties are individual and not result of constituting elements in
  1. metals
  2. non-metals
  3. mixtures
  4. compounds
Al+3 indicates that
  1. It needs -3 valency to become stable
  2. It has high positive charge
  3. Aluminum is found in Group-II
  4. Both A and B
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