JEE Main · 2019 · 09 Jan 2019 · Shift 2 · Surface Chemistry

For coagulation of arsenious sulphide sol, which one of the following salt solution will be most effective?

(A) $BaCl_{2}$
(B) $AlCl_{3}$ ✓ Correct
(C)NaCl
(D) $Na_{3} PO_{4}$

Answer: (B)

Solution

Arsenious sulphide sol,

As X_{2} S X_{3}

, carries a negative charge, so by the Hardy--Schulze rule the coagulating ion is the cation, and the higher its charge the more effective it is. Of the salts offered,

AlCl X_{3}

supplies the triply charged

Al X^{3 +}

, which outdoes

Ba X^{2 +}

and

Na X^{+}

, so it coagulates the sol most powerfully.

JEE Main · 2019 · 09 Jan 2019 · Shift 2 · Single correct option

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