Surface Chemistry Test

Result

Surface Chemistry Test - 12

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

Which of the following is incorrect for physisorption?

A
Reversible

B
Increases with increase in temperature

C
Low heat of adsorption

D
Increases with increase in surface area

Solution

Since the adsorption process is exothermic, the physical adsorption occurs readily at low temperature and decreases with increase in temperature (Le-Chatelier's principle).

Hence, option B is incorrect.
Question 2
1 / -0

Soap removes grease by:

A
adsorption

B
emulsification

C
coagulation

D
none of these

Solution

Soap is an excellent cleanser because of its ability to act as an emulsifying agent. An emulsifier is capable of dispersing one liquid into another immiscible liquid. This means that while oil (which attracts dirt) doesn't naturally mix with water, soap can suspend oil/dirt in such a way that it can be removed.

Grease and oil are nonpolar and insoluble in water. When soap and soiling oils are mixed, the nonpolar hydrocarbon portion of the micelles breaks up the nonpolar oil molecules. A different type of micelle then forms, with nonpolar soiling molecules in the centre. Thus, grease and oil and the 'dirt' attached to them are caught inside the micelle and can be rinsed away.

Hence, the correct option is $$\text{B}$$
Question 3
1 / -0

The polar end in soap is called :

A
hydrophilic

B
hydrophobic

C
lipophilic

D
none of these

Solution

When used for cleaning, soap allows insoluble particles to become soluble in water and rinsed away. The insoluble fat molecules become associated inside micelles tiny spheres formed from soap molecules with polar hydrophilic groups on outside and lipophilic pocket which shields the fat molecule from the water making it soluble.
Question 4
1 / -0

Carbocation having more stability is :

A
$$1^0 carbocation$$

B
$$2^0 carbocation$$

C
$$3^0 carbocation$$

D
$$none$$

Question 5

1 / -0

Milk is an example of:

emulsion

suspension

foam

sol

Solution

Dispersed Phase	Dispersion Medium	Name	Example
Solid	Solid	Solid sol	Coloured glass, gems, alloys
Solid	Liquid	sol	Paints, inks, white of eggs mud
Solid	Gas	Aerosol	Smoke, dust
Liquid	Solid	Gel	Curds, pudding, cheese, jellies
Liquid	Liquid	Emulsion	Milk, Cream, Better, Oil in water
Liquid	Gas	Liquid Aerosol	Clouds, Mist, fog (water in air)

Question 6
1 / -0

Hydrophobic is another name for a substance which:

A
bonds weakly to oil

B
bonds weakly to water

C
repels oil

D
attracts water

Solution

Hydrophobic is another name for a substance which bonds weakly to water. Hydrophobic means " water fearing". These compounds do not dissolve easily in water, and are usually non-polar. Oils and other long hydrocarbons are hydrophobic.
Question 7
1 / -0

What is the function of germ pore ?

A
Absorption of water for seed germination

B
Initiation of pollen tube

C
Release of male gametes

D
Release of female gametes

Solution

$$\text{A germ pore is a small pore in the outer wall of fungal pore which is used for initiation of pollen tube.}$$
Question 8
1 / -0

Which letter corresponds to the activation energy of the reaction after the addition of a catalyst?

A
A

B
B

C
C

D
D

E
E

Solution

E is the correct option. Catalyst decreases the activation energy requirement and increases the rate of the chemical reaction. Here A is the activation energy required for the reaction to occur when there is no catalyst. And E is the activation energy required for the reaction to occur in presence of a catalyst.
Question 9
1 / -0

Which of the following is regarded as a solid sol?

A
Pigmented plastics

B
Coloured glasses

C
Both A and B

D
None of the above

Solution

In solid sol, dispersed phase is solid and dispersion medium is also solid. Pigmented plastics, coloured glasses are examples of solid sol.
Question 10
1 / -0

Hydrogen in palladium is an example of:

A
gas in gas

B
gas in liquid

C
liquid in solid

D
gas in solid

Solution

Hydrogen exists as gas where palladium is in element existing as solid.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Surface Chemistry Test - 12

Result

Surface Chemistry Test - 12

Score

-

Rank

-

SHARING IS CARING

Question 1

Reversible

Increases with increase in temperature

Low heat of adsorption

Increases with increase in surface area

Solution

Question 2

adsorption

emulsification

coagulation

none of these

Solution

Question 3

hydrophilic

hydrophobic

lipophilic

none of these

Solution

Question 4

$$1^0 carbocation$$

$$2^0 carbocation$$

$$3^0 carbocation$$

$$none$$

Question 5

emulsion

suspension

foam

sol

Solution

Question 6

bonds weakly to oil

bonds weakly to water

repels oil

attracts water

Solution

Question 7

Absorption of water for seed germination

Initiation of pollen tube

Release of male gametes

Release of female gametes

Solution

Question 8

A

B

C

D

E

Solution

Question 9

Pigmented plastics

Coloured glasses

Both A and B

None of the above

Solution

Question 10

gas in gas

gas in liquid

liquid in solid

gas in solid

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.