Surface Chemistry Test

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Surface Chemistry Test - 42

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Weekly Quiz Competition

Question 1
1 / -0

Dyeing of fibre involves the process of:

A
adsorption

B
absorption

C
sorption

D
all of these

Solution

Absorption is a process by which a substance(the adsorbate) initially present in one phase becomes preferably attached to another phase (the adsorbate). In the dyeing process, the adsorbate comprises the dye molecule taken up by the fibre substance, which is absorbent.

Hence, the correct option is $$\text{A}$$
Question 2
1 / -0

Which of the following is the emulsion of water in oil?

A
Buttermilk

B
Milk

C
Cold cream

D
Vanishing cream

Solution

Cold cream and cod liver oil are examples of water in oil type of emulsion. Water is dispersed phase and oil is dispersion medium.

Milk is an example of oil in water type of emulsion.
Question 3
1 / -0

Soaps do not work with hard water containing calcium and magnesium ions because:

A
$$Ca^{2+} $$ and $$Mg^{2+}$$ ions form insoluble calcium and magnesium salts in the form of scum

B
$$Na^+$$ and $$K^+$$ present in soap react with $$Ca^{2+}$$ and hinder the cleansing process

C
a large amount of soap is to be used in presence of $$Ca^{2+}$$ and $$Mg^{2+}$$

D
scum formed by the combination of $$Na^+, Ca^{2+}$$ and $$Mg^{2+}$$ stick to the cloth and are not removed on agitation

Solution

$$Ca^{2+}$$and $$Mg^{2+}$$ ions insoluble calcium and magnesium soaps respectinely when sodium or potassium soaps are dissolved in hard water.
$$^7C_{17}H_{15}COONa+CaCl_2\rightarrow 2NaCl+(C_{17}H_{35}COO)_2Ca$$
Soap Insoluble calcium stearate (soap)
These insoluble soaps separate as scum in water and are useless as cleaning agents.
Question 4
1 / -0

What are the hydrolysis products of glyceryl oleate $$(C_{17}H_{32}COOH)_3C_3H_5$$ during preparation of soap?

A
$$C_6H_{32}COONa + C_3H_5OH$$

B
$$C_{17}H_{32}COOH+CH_3CH_2CH_2OH$$

C
$$C_{17}H_{32}COOH+CH_2OH- CHOH - CH_2OH$$

D
$$C_{17}H_{32}COONa+CH_2OH-CHOH-CH_2OH$$
Question 5
1 / -0

During adsorption which of the following is positive?

A
$$\Delta G$$

B
$$T\Delta S$$

C
$$\Delta G + T\Delta S$$

D
none of these

Solution

$$\triangle G=\triangle H+T\triangle S$$

For adorption to be spontaneous, $$\triangle G$$ must be negative. $$\triangle H $$ has a significantly high negative value as $$T\triangle S$$ is positive.

Hence, none of these is the correct option.
Question 6
1 / -0

Which of the following metals, adsorb hydrogen on their surface?

A
$$Zn$$

B
$$Pd$$

C
$$Pt$$

D
$$K$$

Solution

Hydrogen, as a surface adsorbate and a bulk impurity, plays an important role in determining the electronic and catalytic properties of zinc oxide, but the nature of the interaction between these two species remains poorly understood. So we can say that zinc can absorb hydrogen on their surface.
Question 7
1 / -0

Which of the following is correct about the adsorption of $${N}_{2}$$ over iron?

A
It is always physically adsorbed

B
Extent of adsorption over iron decreases with the increase in temperature first and then increases

C
It is always chemically adsorbed

D
$${N}_{2}$$ is never adsorbed over iron

Solution

$${ N }_{ 2 }$$ is chemisorbed at room temperature over iron.
$$\Rightarrow$$ At $$83K$$, $${ N }_{ 2 }$$ gas is physically absorbed over iron and raising the temperature to $$773K$$ results $${ N }_{ 2 }$$ gas being chemisorbed over the iron as atomic $${ N }_{ 2 }$$.
Question 8
1 / -0

Which of the following statement regarding a catalyst in an equilibrium| process is correct?

A
It increases the rate of forward reaction only

B
It hastens the easy attainment of equilibrium

C
It increases the activation energy of both the forward and backward process

D
It decreases the rate of backward process

E
It decreases the activation energy of direct process It increases the activation energy of backward process

Solution

catalyst is chemical compound we to enhance rate of forward reaction without participate in actor product
So option $$A$$ is correct
Catalyst also decreases activation energy
Question 9
1 / -0

Rate of physisorption decreases with :

A
decrease in temperature

B
increase in temperature

C
decrease in pressure

D
decrease in surface area

Solution

The rate of physisorption decreases with decrease in surface area. As the surface area of the adsorbent is decreased there will be less place for the adsorbate to be adsorbed.
Hence option D is correct.
Question 10
1 / -0

The ease of adsorption of the hydrated alkali metal ions on an ion-exchange resins fallows the order:

A
$${ K }^{ + }\quad <\quad { Na\quad +\quad Rb }^{ + }\quad <\quad { Li }^{ + }$$

B
$${ Na }^{ + }\quad <\quad { { Li }^{ + }\quad +\quad K }^{ + }\quad <\quad { Rb }^{ + }$$

C
$${ Li }^{ + }\quad <\quad { { K }^{ + }\quad +\quad Na }^{ + }\quad <\quad { Rb }^{ + }$$

D
$${ Rb }^{ + }\quad <\quad { { K }^{ + }\quad +\quad Na }^{ + }\quad <\quad { Li }^{ + }$$

Solution

Ease of adsorption of the hydrated alkali metal ions on an ion-exchange resin decreases as the size of alkali metal ion increases.
Since the order of the size of alkali metal ion follows the order-
$${Li}^{+} < {Na}^{+} < {K}^{+} < {Rb}^{+}$$
Therefore, the ease of adsorption follows the order-
$${Rb}^{+} < {K}^{+} < {Na}^{+} < {Li}^{+}$$

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Re-Attempt Weekly Quiz Competition

Surface Chemistry Test - 42

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Surface Chemistry Test - 42

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SHARING IS CARING

Question 1

adsorption

absorption

sorption

all of these

Solution

Question 2

Buttermilk

Milk

Cold cream

Vanishing cream

Solution

Question 3

$$Ca^{2+} $$ and $$Mg^{2+}$$ ions form insoluble calcium and magnesium salts in the form of scum

$$Na^+$$ and $$K^+$$ present in soap react with $$Ca^{2+}$$ and hinder the cleansing process

a large amount of soap is to be used in presence of $$Ca^{2+}$$ and $$Mg^{2+}$$

scum formed by the combination of $$Na^+, Ca^{2+}$$ and $$Mg^{2+}$$ stick to the cloth and are not removed on agitation

Solution

Question 4

$$C_6H_{32}COONa + C_3H_5OH$$

$$C_{17}H_{32}COOH+CH_3CH_2CH_2OH$$

$$C_{17}H_{32}COOH+CH_2OH- CHOH - CH_2OH$$

$$C_{17}H_{32}COONa+CH_2OH-CHOH-CH_2OH$$

Question 5

$$\Delta G$$

$$T\Delta S$$

$$\Delta G + T\Delta S$$

none of these

Solution

Question 6

$$Zn$$

$$Pd$$

$$Pt$$

$$K$$

Solution

Question 7

It is always physically adsorbed

Extent of adsorption over iron decreases with the increase in temperature first and then increases

It is always chemically adsorbed

$${N}_{2}$$ is never adsorbed over iron

Solution

Question 8

It increases the rate of forward reaction only

It hastens the easy attainment of equilibrium

It increases the activation energy of both the forward and backward process

It decreases the rate of backward process

It decreases the activation energy of direct process It increases the activation energy of backward process

Solution

Question 9

decrease in temperature

increase in temperature

decrease in pressure

decrease in surface area

Solution

Question 10

$${ K }^{ + }\quad <\quad { Na\quad +\quad Rb }^{ + }\quad <\quad { Li }^{ + }$$

$${ Na }^{ + }\quad <\quad { { Li }^{ + }\quad +\quad K }^{ + }\quad <\quad { Rb }^{ + }$$

$${ Li }^{ + }\quad <\quad { { K }^{ + }\quad +\quad Na }^{ + }\quad <\quad { Rb }^{ + }$$

$${ Rb }^{ + }\quad <\quad { { K }^{ + }\quad +\quad Na }^{ + }\quad <\quad { Li }^{ + }$$

Solution

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