NEET Chemistry The s-Block Elements Questions Solved


Potash alum is used in purification of water because:

(a) it kills the micro-organisms

(b) it precipitates the colloidal matter

(c) it removes the hardness of water

(d) it catalyses the removal of impurities

(b) Al3+ is very good coagulant for negatively charged dispersion in water

Difficulty Level:

  • 18%
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  • 30%
  • 15%
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