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Question

Which of the following order is true about the flocculation power in the coagulation of negative solution?


A

Al3+>Ba2+>Na+

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B

Ba2+>Na+>Al3+

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C

Na+>Al3+>Na+

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D

Na+>Al3+>Ba2+

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Solution

The correct option is A

Al3+>Ba2+>Na+


Explanation for the correct option:

A) Al3+>Ba2+>Na+

  • A positive ion is necessary for flocculation with a negative sol.
  • The ability of the additional flocculating ion to precipitate increases with valence. The flocculation power of a cation decreases with a decrease in the cation's valence.
  • So the flocculating power will be more for the cation that carries a more positive charge.
  • Hence, Al3+ comes first, then comes Ba2+ and then last Na+.

Explanation for the correct options:

The flocculation power in the coagulation of the negative solution follows this trend Al3+>Ba2+>Na+. Thus, options B, C, and D are incorrect.

Hence, option (A) is correct i.e. Al3+>Ba2+>Na+


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