Chemistry>Physical Chemistry>Surface Chemistry>Properties of Colloidal Solutions

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The Rubin number which was proposed by Ostwald as an alternative to the Gold number in order to measure the protective efficiency of a lyophilic colloid may be defined as the:

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Important Questions on Surface Chemistry

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Chemistry>Physical Chemistry>Surface Chemistry>Properties of Colloidal Solutions

Identify the correct statements from the following
I) Protective power of a lyophobic colloid is expressed by gold number
II) Haemoglobin is a positively charged sol
III) Metal sols are prepared by peptization process
IV) Colloidal solution and true solution can be distinguished by Tyndall effect

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Chemistry>Physical Chemistry>Surface Chemistry>Properties of Colloidal Solutions

Write any two differences between lyophilic and lyophobic colloids.

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Chemistry>Physical Chemistry>Surface Chemistry>Properties of Colloidal Solutions

Gold numbers of protective colloids

A, B, C

and

D

are.

0.50,

0.01, 0.10 and 0.005

Respectively. The correct order of their protective powers is

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Chemistry>Physical Chemistry>Surface Chemistry>Properties of Colloidal Solutions

Which of the following electrolytes will have maximum coagulating value for

AgI / {Ag}^{+}

sol?

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Chemistry>Physical Chemistry>Surface Chemistry>Properties of Colloidal Solutions

The coagulation values in millimoles per litre of the electrolytes used for the coagulation of

A s_{2} S_{3}

are given below,

I .

(N a C l) = 52

II .

(B a C l_{2}) = 0.69

III .

(M g S O_{4}) = 0.22

The correct order of their coagulating power is

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Chemistry>Physical Chemistry>Surface Chemistry>Properties of Colloidal Solutions

Which of the following has the highest coagulating power for

{As}_{2} S_{3}

colloid?

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Chemistry>Physical Chemistry>Surface Chemistry>Properties of Colloidal Solutions

Why are lyophilic colloids used as protective colloids?

HARD

Chemistry>Physical Chemistry>Surface Chemistry>Properties of Colloidal Solutions

State Hardy - Schulze rule.

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Chemistry>Physical Chemistry>Surface Chemistry>Properties of Colloidal Solutions

Gold numbers of some colloids are Gelatin:

0.005 - 0.01

, Gum Arabic:

0.15 - 0.25

, Oleate:

0.04 - 1.0

, Starch:

15 - 25

. Which among the following is a better protective colloid?

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Chemistry>Physical Chemistry>Surface Chemistry>Properties of Colloidal Solutions

The correct option among the following is.

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Chemistry>Physical Chemistry>Surface Chemistry>Properties of Colloidal Solutions

Most suitable salt which can be used for efficient clotting of blood will be?

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Chemistry>Physical Chemistry>Surface Chemistry>Properties of Colloidal Solutions

The coagulating power of electrolytes having ions

{Na}^{+}

,

{Al}^{3 +}

and

{Ba}^{2 +}

for arsenic sulphide sol increases in the order,

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Chemistry>Physical Chemistry>Surface Chemistry>Properties of Colloidal Solutions

The movemet of colloidal particles towards respective electrode under electric field is called

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Chemistry>Physical Chemistry>Surface Chemistry>Properties of Colloidal Solutions

Among the following, the ion which will be more effective for flocculation of

Fe (OH)_{3}

solution is

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Chemistry>Physical Chemistry>Surface Chemistry>Properties of Colloidal Solutions

For the coagulation of a negative sol, the species below, that has the highest flocculating power is:

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Chemistry>Physical Chemistry>Surface Chemistry>Properties of Colloidal Solutions

The correct decreasing order of coagulation power for

{As}_{2} S_{3}

sols is

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Chemistry>Physical Chemistry>Surface Chemistry>Properties of Colloidal Solutions

During electrophoresis of colloidal sol of

Fe (OH)_{3},

the colloidal particles

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Chemistry>Physical Chemistry>Surface Chemistry>Properties of Colloidal Solutions

As per Hardy-Schulze formulation, the flocculation values of the following for ferric hydroxide sol are in the order:

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Chemistry>Physical Chemistry>Surface Chemistry>Properties of Colloidal Solutions

Under ambient conditions, which among the following surfactants will form micelles in aqueous solution at lowest molar concentration?

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Chemistry>Physical Chemistry>Surface Chemistry>Properties of Colloidal Solutions

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