Ncert Exercises & Solutions

The electrolytes with maximum coagulating value for Ag/Ag⁺ sol is:

1. Na₂S

2. Na₃PO₄

3. Na₂SO₄

4. NaCl

HINT: Higher the coagulation power of an ion, lower will be its coagulation value.

Explanation: According to Hardy-Schulze law, the lower the charge on the anion greater will be its coagulating value. Please note that coagulating value and coagulating power are not the same and are inverse of each other.

Electrolytes

Anionic Part

Charge on anion

Na2S

Na3PO4

Na2 SO4

NaCl

S2-

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

${SO}_{4}^{2 -}$

Cl-

Here, $P {O_{4}}^{3 -}$ have the highest charge. Hence, $P {O_{4}}^{3 -}$ have the lowest coagulating value.and Cl^- ion being the minimum charge will have lowest coagulating power or highest coagulating value. So, NaCl is the correct answer.

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