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Q)

The coagulating power of electrolytes having ions $Na^+, Al^{3+}$ and $Ba^{2+}$ for arsenic sulphide sol increases in the order :


( A ) $Ba^{2+} < Na^+ < Al^{3+}$
( B ) $Al^{3+} < Na^+ < Ba^{2+}$
( C ) $Al^{3+} < Ba^{2+} < Na^+$
( D ) $Na^+ < Ba^{2+} < Al^{3+}$

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