Surface Chemistry Test

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Surface Chemistry Test - 19

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Weekly Quiz Competition

Question 1
4 / -1

Peptization is a process of

A
Precipitation of colloidal particles

B
Purification of colloids

C
Dispersing precipitate into colloidal sols

D
Movement of colloidal particles in the electrical field
Question 2
4 / -1

As₂S₃ sol. is

A
Positive colloid

B
Negative colloid

C
Neutral colloid

D
None of the above
Question 3
4 / -1

Sulphur sol contains

A
Discrete Sulphur atoms

B
Discrete Sulphur molecules

C
Large aggregates of Sulphur molecules

D
Water dispersed in solid Sulphur
Question 4
4 / -1

Cow milk is an example of natural emulsion stabilized by

A
Fat

B
Water

C
Casein

D
Mg⁺⁺ ions
Question 5
4 / -1

The colour of the colloidal particles of gold obtained by different methods differ because of

A
Variable valency of gold

B
Different concentration of gold particles

C
Different types of impurities

D
Different diameters of colloidal particles
Question 6
4 / -1

Which one of the following statements regarding catalysis is not true?

A
A catalyst remains unchanged at the end of the reaction

B
A catalyst can initiate a reaction

C
A catalyst does not alter the equilibrium in a reversible reaction

D
Catalysts are sometimes very specific in terms of reactions
Question 7
4 / -1

Crystalloids differ from colloids mainly in respect of

A
Electrical behavior

B
Particle size

C
Particle nature

D
Solubility
Question 8
4 / -1

A colloidal solution is subjected to an electrical field. The particles move towards anode. The coagulation of same sol is studied using NaCl, BaCl₂ and AlCl₃ solutions. Their coagulating power should be

A
NaCl > BaCl₂ > AlCl₃

B
BaCl₂ > AlCl₃ > NaCl

C
AlCl₃ > BaCl₂ > NaCl

D
BaCl₂ > NaCl > AlCl₃
Question 9
4 / -1

For adsorption of a gas on a solid, the plot of log x/m vs log P is linear with slope equal to (n being whole number)

A
k

B
Log k

C
n

D
1/n

Solution
Question 10
4 / -1

Peptization denotes

A
Digestion of food

B
Hydrolysis of proteins

C
Breaking and dispersion into the colloidal state

D
Precipitation of solid from colloidal dispersion

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Surface Chemistry Test - 19

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Surface Chemistry Test - 19

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Question 1

Precipitation of colloidal particles

Purification of colloids

Dispersing precipitate into colloidal sols

Movement of colloidal particles in the electrical field

Question 2

Positive colloid

Negative colloid

Neutral colloid

None of the above

Question 3

Discrete Sulphur atoms

Discrete Sulphur molecules

Large aggregates of Sulphur molecules

Water dispersed in solid Sulphur

Question 4

Fat

Water

Casein

Mg++ ions

Question 5

Variable valency of gold

Different concentration of gold particles

Different types of impurities

Different diameters of colloidal particles

Question 6

A catalyst remains unchanged at the end of the reaction

A catalyst can initiate a reaction

A catalyst does not alter the equilibrium in a reversible reaction

Catalysts are sometimes very specific in terms of reactions

Question 7

Electrical behavior

Particle size

Particle nature

Solubility

Question 8

NaCl > BaCl2 > AlCl3

BaCl2 > AlCl3 > NaCl

AlCl3 > BaCl2 > NaCl

BaCl2 > NaCl > AlCl3

Question 9

k

Log k

n

1/n

Solution

Question 10

Digestion of food

Hydrolysis of proteins

Breaking and dispersion into the colloidal state

Precipitation of solid from colloidal dispersion

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Mg⁺⁺ ions

NaCl > BaCl₂ > AlCl₃

BaCl₂ > AlCl₃ > NaCl

AlCl₃ > BaCl₂ > NaCl

BaCl₂ > NaCl > AlCl₃