Question

Statement 1: For the coagulation of sols carrying positive charge, $P{O}_4^{3-}$ ions are more efficient than $S{O}_4^{2-}$ or $C{l}^{-}$ ions.
Statement 2:This follows Hardy - Schulze rule.

• A. If both Statement $1$ and Statement $2$ are true and the statement $2$ is the correct explanation of the statement $1$
• B. If both Statement $1$ and Statement $2$ are true but statement $2$ is not the correct explanation of the statement $1$
• C. If Statement $1$ is true but Statement $2$ is false
• D. If Statement $1$ is false but Statement $2$ is true

Answer 1

Answer: (A)

Both statements are true and statement $2$ is the correct explanation of statement $1$.
According to Hardy-Schulze rule: Coagulating power of an electrolyte is directly proportional to the fourth power of the valency of the ions causing coagulation.