Surface Chemistry Test

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Surface Chemistry Test - 24

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Weekly Quiz Competition

Question 1
1 / -0

Animal charcoal is used in decolorising colour of liquids because it is a good :

A
adsorbate

B
adsorbent

C
oxidising agent

D
reducing agent

Solution

Adsorbate adsorbs impurities from surface of substance

Animal charcoal is good adsorbate. The impurities adsorb on its surface and thus it decolourises colour of liquids.
Question 2
1 / -0

Toothpaste and mud are examples of :

A
foam and sol respectively

B
sol

C
gel and emulsion respectively

D
foam

Solution

Mud and toothpaste are example of sol in which dispersed phase is solid and dispersion medium it s liquid.
Question 3
1 / -0

The physical adsorption of gases on the solid surface is due to:

A
covalent bond

B
hydrogen bond

C
ionic bond

D
van der wal's force

Solution

When the force of attraction existing between adsorbate and adsorbent are weak Vanderwaal forces of attraction, the process is called Physical Adsorption or Physisorption. When the force of attraction existing between adsorbate and adsorbent are chemical forces of attraction or chemical bond, the process is called Chemical Adsorption.
Question 4
1 / -0

Match the columns.
I) Dust a) Gel
II) Milk b) Emulsion
III) Toothpaste c) Solid aerosol
IV) Opal d) Sol

A
I-d, II-a, III-c, IV-b

B
I-c, II-b, III-d, IV-a

C
I-b, II-c, III-a, IV-d

D
I-a, II-d, III-b, IV-c

Solution

Dust is a solid aerosol, dispersion medium in it is gas and the dispersed phase is solid.

Opal is a gel and dispersed phase in it is liquid and the dispersion medium is solid.

Toothpaste is a sol where the dispersed phase is solid and the dispersion medium is liquid.

Also, milk is an emulsion.
Question 5
1 / -0

Peptization denotes:

A
digestion of food

B
hydrolysis of proteins

C
breaking and dispersion into colloidal state

D
precipitation of solid from colloidal dispersion

Solution

$$Explanation:$$

Peptization is a process in which colloidal solution is prepared by adding electrolyte to a precipitate. The electrolyte is added called as peptizing agent. This peptization process also called as deflocculation.

Example: when the ferric chloride solution is added to the ferric hydroxide precipitate, it gives sol of ferric hydroxide.

Therefore , we can say that in peptization, precipitate breaks and disperse into a colloidal solution.

$$Final\ Answer:$$ Option $$C$$.
Question 6
1 / -0

Find the false statement for chemical catalysts ?

A
They are not consumed during the chemical reaction

B
They cannot make nonspontaneous reactions occur

C
They do not have to be the same phase as the reactant molecules

D
They shift equilibrated reactions to the product's side

E
Enzymes are biological catalysts

Solution

The statement (D) is the incorrect statement regarding chemical catalysts. Catalyst only increases the rates of forward and reverse reactions. It does not affect the position of the equilibrium.
Question 7
1 / -0

In the presence of a catalyst, the heat evolved or absorbed during the reaction:

A
increases

B
decreases

C
remains unchanged

D
may increase or decrease

Solution

The enthalpy change value of the reaction will not be affected by a catalyst. A catalyst will only lower the required activation energy for the reactions. Since it will lower the activation energy for both the forward and reverse reactions to the same extent, the net change in enthalpy is zero.
Question 8
1 / -0

When two immiscible liquids are shaken together vigorously, it may form :

A
a solution

B
a tincture

C
a sediment

D
a hydrated solution

E
a colloidal dispersion

Solution

When two immiscible liquids are shaken together vigorously, it may form a colloidal dispersion.
The solute particles (disperse phase) are suspended in solvent (dispersion medium).
The disperse phase particles are small enough not to settle and not to be seen under microscope.
Question 9
1 / -0

Peptisation is a process in which:

A
precipitation becomes true solution

B
true solution becomes a suspension

C
a colloid gets coagulation

D
a suspension gets converted into a colloid

Solution

Peptisation is a method of preparation of colloids in which a freshly formed precipitate is stirred with a peptizing agent (suitable electrolyte). The adsorption of the ions of the electrolyte by the particles of the precipitate leads to peptisation.
Question 10
1 / -0

Which of the following rules states that with the increase of every $${ 10 }^{ \circ }C$$ temperature the rate of metabolic activity gets doubled?

A
Van't Hoff's rule

B
Bergman's rule

C
Allen's rule

D
Jordon's rule

Solution

Van't Hoff's rule states that the velocity or the metabolic activity is doubled for every rise of 10$$^0$$C in temperature.

Bergmann's rule states that species of larger size are found in colder environments and species of smaller size are found in warmer environments.

Allen's rule states that body form is linear in warm climates and more rounded and compact in cold climates. Round body shapes give a smaller surface area to volume ratio.

Jordon's rule states that fin ray, vertebrae or scale numbers increase with the decrease in temperature.

Thus, the correct answer is option A.

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I)	Dust	a)	Gel
II)	Milk	b)	Emulsion
III)	Toothpaste	c)	Solid aerosol
IV)	Opal	d)	Sol

Surface Chemistry Test - 24

Result

Surface Chemistry Test - 24

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Question 1

adsorbate

adsorbent

oxidising agent

reducing agent

Solution

Question 2

foam and sol respectively

sol

gel and emulsion respectively

foam

Solution

Question 3

covalent bond

hydrogen bond

ionic bond

van der wal's force

Solution

Question 4

I-d, II-a, III-c, IV-b

I-c, II-b, III-d, IV-a

I-b, II-c, III-a, IV-d

I-a, II-d, III-b, IV-c

Solution

Question 5

digestion of food

hydrolysis of proteins

breaking and dispersion into colloidal state

precipitation of solid from colloidal dispersion

Solution

Question 6

They are not consumed during the chemical reaction

They cannot make nonspontaneous reactions occur

They do not have to be the same phase as the reactant molecules

They shift equilibrated reactions to the product's side

Enzymes are biological catalysts

Solution

Question 7

increases

decreases

remains unchanged

may increase or decrease

Solution

Question 8

a solution

a tincture

a sediment

a hydrated solution

a colloidal dispersion

Solution

Question 9

precipitation becomes true solution

true solution becomes a suspension

a colloid gets coagulation

a suspension gets converted into a colloid

Solution

Question 10

Van't Hoff's rule

Bergman's rule

Allen's rule

Jordon's rule

Solution

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