Question

The flocculation value of $BaCl _{2}$ is much less than that of $KCl$ for sol $A$ and the flocculation value of $Na _{2} SO _{4}$ is much less than that of $NaBr$ for $Sol B$. The correct statement among the following is:

• A. Both the sols A and B are negatively charged
• B. Sol A is positively charged arid Sol B is negatively charged
• C. Both the sols A and B are positively charged
• D. Sol A is negatively charged and sol B is positively charged

Answer 1

Answer: (B)

In first case the given compounds have same anion but different cations having different charge hence they will precipitate negatively charged sol i.e. ‘A’.
In second case the given compounds have similar cation but different anion with different charge. Hence they will precipitate positively charged sol. i.e. ‘B’.