A colloidal solution is subjected to an electrical field. The particles move towards anode. The coagulation of same sol 
is studied using NaCl, BaCl2 and AlCl3solutions. Their coagulating power should be 

  1. A

    NaCl>BaCl2>AlCl3

  2. B

    BaCl2>AlCl3>NaCl

  3. C

    AlCl3>BaCl2>NaCl

  4. D

    BaCl2>NaCl>AlCl3

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    Solution:

    The movement towards anode shows that sol is negative. For coagulation of negative sol. Cation with higher charge is more effective. 

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