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Test: Surface Chemistry - Chemistry MCQ


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19 Questions MCQ Test Physical Chemistry - Test: Surface Chemistry

Test: Surface Chemistry for Chemistry 2024 is part of Physical Chemistry preparation. The Test: Surface Chemistry questions and answers have been prepared according to the Chemistry exam syllabus.The Test: Surface Chemistry MCQs are made for Chemistry 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Surface Chemistry below.
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Test: Surface Chemistry - Question 1

The correct ascending order of adsorption of the following gases on the same mass of charcoal at same temperature and pressure is

Detailed Solution for Test: Surface Chemistry - Question 1

The extent of adsorption increases with increase in polarity and molar mass so the correct option is b.

Test: Surface Chemistry - Question 2

Collodion is 4% solution of which one of the following in alcohol-ether mixture.

Detailed Solution for Test: Surface Chemistry - Question 2

Nitrocellulose when dissolved in 4% alcohol-ether mixture is called collodion

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Test: Surface Chemistry - Question 3

H2 gas is adsorbed on activated charcoal to a very little extent in comparison to easily liquefiable gases due to.

Detailed Solution for Test: Surface Chemistry - Question 3

It is due to weak van der Waals’ forces of attraction.

Test: Surface Chemistry - Question 4

The coagulation values in millimoles per litre of the electrolyte for the coagulation of As2S3 sol are given
I. NaCl (52)
II. BaCl2 (0.69)
III. MgSO4 (0.22)
The correct order of coagulating power is

Detailed Solution for Test: Surface Chemistry - Question 4

∵ Lesser the coagulation value, more is coagulating power meaning it is inversely proportional.

Test: Surface Chemistry - Question 5

3g of activated charcoal was added to 50 ml of acetic acid solution (0.06 M) in a flask. After an hour it was filtered and the strength of filtrate was found to be 0.042 M. The amount of acetic acid adsorbed per gram of charcoal is

Detailed Solution for Test: Surface Chemistry - Question 5

To find the amount of acetic acid adsorbed per gram of charcoal, we need to calculate the mass of acetic acid adsorbed by the activated charcoal and divide it by the mass of charcoal used.

The initial concentration of acetic acid is 0.06 M, and after adsorption, the final concentration is 0.042 M. The difference between the initial and final concentrations represents the amount of acetic acid adsorbed by the activated charcoal.

0.06 M - 0.042 M = 0.018 M

Now we need to find the mass of acetic acid (in grams) that was adsorbed by the activated charcoal. We can use the equation: molarity x volume = moles

0.018 M x 50 ml = 0.9 moles

Now, we can find mass of acetic acid adsorbed by mass = moles x molar mass

mass = 0.9 moles x 60 g/mol = 54 g

Now we need to divide the mass of acetic acid adsorbed by the mass of activated charcoal used:

54 g / 3 g = 18 g/g

Therefore, the amount of acetic acid adsorbed per gram of charcoal is 18 mg, So the correct answer is 2.

Test: Surface Chemistry - Question 6

Which of the following statements are correct about solid catalyst? 

Detailed Solution for Test: Surface Chemistry - Question 6
  • It is called selectivity of catalyst as per requirement.
  • Catalyst changes only the EA (Activation energy) of the reaction.
Test: Surface Chemistry - Question 7

 Gold sol can be prepared by

Detailed Solution for Test: Surface Chemistry - Question 7

2AuCl3 + 3HCHO + 3H2O → 2Au + 3HCOOH + 6HCl

Test: Surface Chemistry - Question 8

Extent of adsorption of adsorbate from solution phase increases with __________

Detailed Solution for Test: Surface Chemistry - Question 8

xm = k C1/n [where ‘C’ is concentration of solution]

Test: Surface Chemistry - Question 9

On the basis of data given below predict which of the following gases shows least adsorption on a definite amount of charcoal?

Detailed Solution for Test: Surface Chemistry - Question 9

The absorption of a gas on a surface is significantly influenced by its critical temperature. When the critical temperature of a gas is higher, there is an enhanced capacity for absorption on the surface of any material. Conversely, lower critical temperatures lead to reduced absorption on the surface. This phenomenon is attributed to the increased attractive forces between the surface and the gaseous molecules at higher critical temperatures. Referring to the provided table, it is evident that hydrogen gas exhibits the lowest critical temperature, making it the least absorbed gas.

Test: Surface Chemistry - Question 10

The formation of micelles takes place only above

Detailed Solution for Test: Surface Chemistry - Question 10

The temperature above which micelles formation takes place is called Kraft temperature.

Test: Surface Chemistry - Question 11

The protective power of lyophilic colloidal sol is expressed in terms of

Detailed Solution for Test: Surface Chemistry - Question 11

Gold number is used to measure protective power of colloids. If the gold number is lowered, the protective power will increase, e.g., gelatin.

Test: Surface Chemistry - Question 12

According to Freundlich adsorption isotherm, which of the following is correct?

Detailed Solution for Test: Surface Chemistry - Question 12
  • All are correct
  • That is correct at low pressure,
  • That is correct at moderate pressure and
  • That is correct at high pressure (saturation pressure).
Test: Surface Chemistry - Question 13

During the adsorption of gas on the surface of solid, which of the following is true?

Detailed Solution for Test: Surface Chemistry - Question 13

ΔG < 0 means process is spontaneous because adsorption is exothermic in nature, ΔH = negative and entropy is decreasing, i.e., ΔS will come out as negative.

Test: Surface Chemistry - Question 14

Which is favorable for physical adsorption?

Detailed Solution for Test: Surface Chemistry - Question 14

Low temperature and high pressure provide help in increased physical adsorption because van der Waals’ forces of attraction will increase.

Test: Surface Chemistry - Question 15

The stability of lyophobic sols is due to

Detailed Solution for Test: Surface Chemistry - Question 15

same charge on particles causes repulsion which further allows particles to settle down.

Test: Surface Chemistry - Question 16

The term ‘sorption’ stands for ___________ .

Detailed Solution for Test: Surface Chemistry - Question 16

When both the processes of adsorption and absorption take place, it is called sorption, e.g., dying of cotton fiber.

Test: Surface Chemistry - Question 17

Physical adsorption of a gaseous species may change to chemical adsorption with ___________.

Detailed Solution for Test: Surface Chemistry - Question 17

At high temperature, covalent bonds will be seen forming as activation energy will be provided.

*Multiple options can be correct
Test: Surface Chemistry - Question 18

Freundlich adsorption isotherm is given by the expression xm = k p1/n which of the following conclusions can be drawn from this expression.

Detailed Solution for Test: Surface Chemistry - Question 18

(a) and (c) are correct, when n = 0.
∴ xm vs p graph is line parallel to x-axis.
when 1n = 0, xm is independent of pressure at high pressure.

Test: Surface Chemistry - Question 19

The best coagulant for the precipitation of Fe(OH)3 sol is

Detailed Solution for Test: Surface Chemistry - Question 19

PO3−4 works in most effective way for positively charged Fe(OH)3sol due to higher charge.

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