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CHXII05:SURFACE CHEMISTRY

320883 A colloidal solution is subjected to an electric field then colloidal particles move towards anode.
The amount of electrolytes of ${BaCl}_{2}, {AlCl}_{3}$ and $NaCl$ required to coagulate the given colloid is in the order

1

NaCl < {BaCl}_{2} > {AlCl}_{3}

2

{BaCl}_{2} < {AlCl}_{3} > NaCl

3

{AlCl}_{3} = NaCl = {BaCl}_{2}

4

{AlCl}_{3} > {BaCl}_{2} > NaCl

Explanation:

As ions are moving toward anode i.e. negatively charged colloid
$\begin{aligned} Coagulation value \propto \frac{1}{cogulating power} \\ ∴ {Na}^{+ 1} > {Ba}^{+ 2} > {Al}^{+ 3} \end{aligned}$

CHXII05:SURFACE CHEMISTRY

320884 Given below are a few electrolytes, indicates which one among them will bring about the coagulation of a gold sol quickest and in the least of concentration?

1

NaCl

2

{MgSO}_{4}

3

{Al}_{2} {({SO}_{4})}_{3}

4

K_{4} [F e (C N)_{6}]

CHXII05:SURFACE CHEMISTRY

320885 Four different colloids have the following gold number. Which one has its most effective action?

1 10

2 30

3 20

4 40

CHXII05:SURFACE CHEMISTRY

320886 Which of the following cations will have minimum flocculation value for arsenic sulphide sol?

1

{Na}^{+}

2

{Mg}^{2 +}

3

{Ca}^{2 +}

4

{Al}^{3 +}

Explanation:

According to Hardy-Schulze rule, higher the coagulating power of an ion, smaller the flocculating value. ${Al}^{3 +} > {Mg}^{2 +}, {Ca}^{2 +} > {Na}^{+}$

KCET - 2013

CHXII05:SURFACE CHEMISTRY

320883 A colloidal solution is subjected to an electric field then colloidal particles move towards anode.
The amount of electrolytes of ${BaCl}_{2}, {AlCl}_{3}$ and $NaCl$ required to coagulate the given colloid is in the order

1

NaCl < {BaCl}_{2} > {AlCl}_{3}

2

{BaCl}_{2} < {AlCl}_{3} > NaCl

3

{AlCl}_{3} = NaCl = {BaCl}_{2}

4

{AlCl}_{3} > {BaCl}_{2} > NaCl

Explanation:

As ions are moving toward anode i.e. negatively charged colloid
$\begin{aligned} Coagulation value \propto \frac{1}{cogulating power} \\ ∴ {Na}^{+ 1} > {Ba}^{+ 2} > {Al}^{+ 3} \end{aligned}$

CHXII05:SURFACE CHEMISTRY

320884 Given below are a few electrolytes, indicates which one among them will bring about the coagulation of a gold sol quickest and in the least of concentration?

1

NaCl

2

{MgSO}_{4}

3

{Al}_{2} {({SO}_{4})}_{3}

4

K_{4} [F e (C N)_{6}]

CHXII05:SURFACE CHEMISTRY

320885 Four different colloids have the following gold number. Which one has its most effective action?

1 10

2 30

3 20

4 40

CHXII05:SURFACE CHEMISTRY

320886 Which of the following cations will have minimum flocculation value for arsenic sulphide sol?

1

{Na}^{+}

2

{Mg}^{2 +}

3

{Ca}^{2 +}

4

{Al}^{3 +}

Explanation:

According to Hardy-Schulze rule, higher the coagulating power of an ion, smaller the flocculating value. ${Al}^{3 +} > {Mg}^{2 +}, {Ca}^{2 +} > {Na}^{+}$

KCET - 2013

CHXII05:SURFACE CHEMISTRY

320883 A colloidal solution is subjected to an electric field then colloidal particles move towards anode.
The amount of electrolytes of ${BaCl}_{2}, {AlCl}_{3}$ and $NaCl$ required to coagulate the given colloid is in the order

1

NaCl < {BaCl}_{2} > {AlCl}_{3}

2

{BaCl}_{2} < {AlCl}_{3} > NaCl

3

{AlCl}_{3} = NaCl = {BaCl}_{2}

4

{AlCl}_{3} > {BaCl}_{2} > NaCl

Explanation:

As ions are moving toward anode i.e. negatively charged colloid
$\begin{aligned} Coagulation value \propto \frac{1}{cogulating power} \\ ∴ {Na}^{+ 1} > {Ba}^{+ 2} > {Al}^{+ 3} \end{aligned}$

CHXII05:SURFACE CHEMISTRY

320884 Given below are a few electrolytes, indicates which one among them will bring about the coagulation of a gold sol quickest and in the least of concentration?

1

NaCl

2

{MgSO}_{4}

3

{Al}_{2} {({SO}_{4})}_{3}

4

K_{4} [F e (C N)_{6}]

CHXII05:SURFACE CHEMISTRY

320885 Four different colloids have the following gold number. Which one has its most effective action?

1 10

2 30

3 20

4 40

CHXII05:SURFACE CHEMISTRY

320886 Which of the following cations will have minimum flocculation value for arsenic sulphide sol?

1

{Na}^{+}

2

{Mg}^{2 +}

3

{Ca}^{2 +}

4

{Al}^{3 +}

Explanation:

According to Hardy-Schulze rule, higher the coagulating power of an ion, smaller the flocculating value. ${Al}^{3 +} > {Mg}^{2 +}, {Ca}^{2 +} > {Na}^{+}$

KCET - 2013

CHXII05:SURFACE CHEMISTRY

320883 A colloidal solution is subjected to an electric field then colloidal particles move towards anode.
The amount of electrolytes of ${BaCl}_{2}, {AlCl}_{3}$ and $NaCl$ required to coagulate the given colloid is in the order

1

NaCl < {BaCl}_{2} > {AlCl}_{3}

2

{BaCl}_{2} < {AlCl}_{3} > NaCl

3

{AlCl}_{3} = NaCl = {BaCl}_{2}

4

{AlCl}_{3} > {BaCl}_{2} > NaCl

Explanation:

As ions are moving toward anode i.e. negatively charged colloid
$\begin{aligned} Coagulation value \propto \frac{1}{cogulating power} \\ ∴ {Na}^{+ 1} > {Ba}^{+ 2} > {Al}^{+ 3} \end{aligned}$

CHXII05:SURFACE CHEMISTRY

320884 Given below are a few electrolytes, indicates which one among them will bring about the coagulation of a gold sol quickest and in the least of concentration?

1

NaCl

2

{MgSO}_{4}

3

{Al}_{2} {({SO}_{4})}_{3}

4

K_{4} [F e (C N)_{6}]

CHXII05:SURFACE CHEMISTRY

320885 Four different colloids have the following gold number. Which one has its most effective action?

1 10

2 30

3 20

4 40

CHXII05:SURFACE CHEMISTRY

320886 Which of the following cations will have minimum flocculation value for arsenic sulphide sol?

1

{Na}^{+}

2

{Mg}^{2 +}

3

{Ca}^{2 +}

4

{Al}^{3 +}

Explanation:

According to Hardy-Schulze rule, higher the coagulating power of an ion, smaller the flocculating value. ${Al}^{3 +} > {Mg}^{2 +}, {Ca}^{2 +} > {Na}^{+}$

KCET - 2013

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