Which of the following has least coagulation value for arseneous sulphide solution?

Question

Which of the following has least coagulation value for arseneous sulphide solution? (A)  SO42-  (B)  PO43-  (C)  Al3+  (D)  Na+

Tardigrade Admin · Accepted Answer

Arseneous sulphide solution is a negative sol. [As2S3] S2-. Hence, to coagulate it, a cation is needed. According to Hardy-SchuIze law, coagulation power of Al3+ will be maximum (as it is trivalent). Hence, its amount required will be the least and therefore, its coagulation value will be least.

Q. Which of the following has least coagulation value for arseneous sulphide solution?

$S O_{4}^{2 -}$

$P O_{4}^{3 -}$

$A l^{3 +}$

$N a^{+}$

Q. Which of the following has least coagulation value for arseneous sulphide solution?

SO42−​

PO43−​

Al3+

Na+

$S O_{4}^{2 -}$

$P O_{4}^{3 -}$

$A l^{3 +}$

$N a^{+}$