For coagulating a negatively charged As2S3 sol, the most effective ion among the following is

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For coagulating a negatively charged $As X_{2} S X_{3}$ sol, the most effective ion among the following is

A $Na X^{+}$
B $K X^{+}$
C $Al X^{3 +}$
D $Cl X^{-}$

Answer: C

By the Hardy-Schulze rule the coagulating ion is the one carrying a charge opposite to that of the sol, and its power increases with its valence. The sol is negative, so cations coagulate it, and the trivalent

Al X^{3 +}

is the most effective.

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For coagulating a negatively charged AsX2​SX3​ sol, the most effective ion among the following is

Answer: C

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For coagulating a negatively charged $As X_{2} S X_{3}$ sol, the most effective ion among the following is