Question

Given below are two statements:
Statement I: In the coagulation of a negative sol, the flocculating power of the three given ions is in the order -
$A{l}^{3+}>B{a}^{2+}>N{a}^{+}$
Statement II : In the coagulation of a positive sol, the flocculating power of the three given salts is in the order -
$NaCl>N{a}_{2}S{O}_4>N{a}_{3}P{O}_4$
In the light of the above statements, choose the most appropriate answer from the options given below :

• A. Statement I is incorrect but Statement II is correct.
• B. Both Statement I and Statement II are correct.
• C. Both Statement I and Statement II are incorrect.
• D. Statement I is correct but Statement II is incorrect.

Answer 1

Answer: (D)

According to Hardy Schulze Rule statement 1 is correct. (Generally, the greater the valence of the flocculating ion added, the greater is its power to cause precipitation)
According to Hardy Schulze Rule statement 2 is incorrect