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JEE · NEET Previous Year Question

$Which of the following cations will have minimum flocculation value for arsenic sulphide sol?$

Topic: JEE PYQ

Answer: D. Full step-by-step solution below.

A $Na^{+}$
B $Mg^{2 +}$
C $Ca^{2 +}$
D $Al^{3 +}$

Correct answer: D

Solution

(d) : According to Hardy-Schulze rule, higher the coagulating power of an ion, smaller the flocculating value. Al^{3 +} > Mg^{2 +}, Ca^{2 +} > Na^{+}

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