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Electrolysis and Electrolytes

The coagulati...

Question

The coagulation power of electrolytes having ions ${N a}^{+}, {A l}^{3 +}$ and ${B a}^{2 +}$ for arsenic sulphide sol increases in the order:

A

{B a}^{2 +} < {N a}^{+} < {A l}^{3 +}

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B

{A l}^{3 +} < {N a}^{+} < {B a}^{2 +}

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C

{A l}^{3 +} < {B a}^{2 +} < {N a}^{+}

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D

{N a}^{+} < {B a}^{2 +} < {A l}^{3 +}

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Solution

The correct option is A ${N a}^{+} < {B a}^{2 +} < {A l}^{3 +}$
Arsenic sulphide is negative sol hence, greater is the positive charge of cation, more will be its coagulating power.
${N a}^{+} < {B a}^{2 +} < {A l}^{3 +} - -------------------- \to I n c r e a s i n g c o a g u l a t i n g p o w e r$

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