NEET 2022 — Chemistry solution

NEET2022Chemistry

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 Al $^{3 +}$ $>$ Ba $^{2 +}$ $>$ Na $^{+}$

Statement II :

In the coagulation of a positive sol, the flocculating power of the three given salts is in the order NaCl $>$ Na $_{2}$ SO $_{4}$ $>$ Na $_{3}$ PO $_{4}$

In the light of the above statements, choose the most appropriate answer from the options given below:

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

Solution

According to the Hardy-Schulze rule, the flocculating power of an ion grows rapidly with the magnitude of its charge.

For a negative sol, positive ions cause coagulation. Charge magnitudes follow Al $^{3 +}$ $>$ Ba $^{2 +}$ $>$ Na $^{+}$ , so Statement I is correct.

For a positive sol, negative ions cause coagulation. Charge magnitudes follow PO $_{4}^{3 -}$ $>$ SO $_{4}^{2 -}$ $>$ Cl $^{-}$ , so the correct order is Na $_{3}$ PO $_{4}$ $>$ Na $_{2}$ SO $_{4}$ $>$ NaCl. Statement II reverses this and is therefore incorrect.

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