Surface Chemistry Test

Surface Chemistry

This is surface chemistry Test-01 for CBSE class 12 Chemistry.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
The substance that gets adsorbed on the surface of the solid is called
  • A
    Adsorbate
    Correct
  • B
    Adsorbent
  • C
    Inner phase
  • D
    Micelle
2
Water vapours are adsorbed by
  • A
    Silica gel
    Correct
  • B
    Charcoal
  • C
    Anhydrous $CaCl_2$
  • D
    Organic dye
3
Adsorption is accompanied by
  • A
    ${\text{T}}\Delta {\text{S}}$for the process is negative
  • B
    Decrease in entropy of the system
  • C
    Decrease in enthalpy of the system
  • D
    All are correct
    Correct
4
The phenomenon in which adsorption and absorption takes place simultaneously is called
  • A
    Chemisorptions
  • B
    Desorption
  • C
    Physisorption
  • D
    Sorption
    Correct
5
Which of the following is true about chemisorption?
  • A
    It usually occurs at low temperature
  • B
    None of these
  • C
    It is highly specific in nature
    Correct
  • D
    It is reversible in nature
6
Adsorption increases when
  • A
    Temperature decreases
    Correct
  • B
    Temperature increases
  • C
    Temperature remains constant
  • D
    None of these
7
Which among the following is a property of physisorption?
  • A
    High enthalpy of adsorption
  • B
    Irreversibility
  • C
    All of the above
  • D
    Non – specific in nature
    Correct
8
Powdered substances are more effective adsorbents than their crystalline forms because
  • A
    Pressure increases
  • B
    Temperature increases
  • C
    Surface area increases
    Correct
  • D
    All of the above
9
Which among the following is true for chemisorptions?
  • A
    Occurs at low temperature
  • B
    Heat of adsorption is low
  • C
    Does not form surface complex
  • D
    Irreversible in nature
    Correct
10
In physisorption, adsorption is generally
  • A
    Monolayered
  • B
    Multilayered
    Correct
  • C
    None of these
  • D
    Bilayered
11
Chromatography is based on the principle of
  • A
    Physical adsorption
    Correct
  • B
    Chemical adsorption
  • C
    Hydrogen bonding
  • D
    Absorption
12
The extent of adsorption increases with the
  • A
    Increase in the surface area of the adsorbent
    Correct
  • B
    Decrease in the pressure of the gas
  • C
    Decrease in the surface area of the adsorbent
  • D
    Increase in temperature
13
The physical adsorption is due to
  • A
    Strong electrostatic forces of attraction
  • B
    Covalent bond
  • C
    Hydrogen bonding
  • D
    Vander waal’s forces
    Correct
14
Substances that alter the rate of a chemical reaction without being used up in a chemical reaction is known as
  • A
    Poisons
  • B
    Inhibitors
  • C
    Promoters
  • D
    Catalyst
    Correct
15
Substances that enhances the activity of a catalyst is known as
  • A
    Promoters
    Correct
  • B
    Poisons
  • C
    Coenzyme
  • D
    Inhibitors