Surface Chemistry Test

Surface Chemistry

This is surface chemistry Test-02 for CBSE class 12 Chemistry.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Enzymes are
  • A
    Substances made by chemists to activate washing powder
  • B
    Very active vegetable catalyst
  • C
    Catalyst found in organisms
    Correct
  • D
    Synthetic catalyst
2
A biochemical catalyst is
  • A
    An amino acid
  • B
    A carbohydrates
  • C
    Nitrogen molecule
  • D
    An enzyme
    Correct
3
The number of phases in colloidal system are
  • A
    One
  • B
    Four
  • C
    Two
    Correct
  • D
    Three
4
The process of separation of colloids by passing through semi permeable membrane is called
  • A
    Ultrafilteration
  • B
    Dialysis|
    Correct
  • C
    Filtration
  • D
    Electrophoresis
5
Liquid – liquid sols are known as
  • A
    Aerosols
  • B
    Gels
  • C
    Foam
  • D
    Emulsions
    Correct
6
Whipped cream is an example of
  • A
    Foam
    Correct
  • B
    Lyophilic sol
  • C
    Suspension
  • D
    Solid emulsion
7
Which among the following substances is an example of multimolecular colloids?
  • A
    Polystyrene
  • B
    Starch sol
  • C
    Micelles
  • D
    Sulphur sol
    Correct
8
Which among the following is not the method of colloidal purification?
  • A
    Electrical disintegration
    Correct
  • B
    Dialysis
  • C
    Electro dialysis
  • D
    Ultrafilteration
9
Tyndall effect in colloidal solution is due to
  • A
    Presence of electrically charged particles
  • B
    Adsorption of light
  • C
    Reflection of light
  • D
    Scattering of light
    Correct
10
Adsorption isobar is a curve showing variation of adsorption
  • A
    With volume at constant pressure
  • B
    With temperature at constant pressure
    Correct
  • C
    With volume at constant temperature
  • D
    With pressure at constant temperature
11
The curve showing the variation of adsorption with pressure at constant temperature is known as
  • A
    Adsorption isochors
  • B
    Adsorption isobar
  • C
    None of these
  • D
    Adsorption isotherm
    Correct
12
The relationship between the adsorption of solutes from solution and the concentration of solution is expressed by
  • A
    $\frac{{\text{x}}}{{\text{m}}} = {\text{k}}{{\text{C}}^{{\text{1/n}}}}$
    Correct
  • B
    $\frac{{\text{x}}}{{\text{m}}} = {\text{k}}{{\text{C}}^{\text{n}}}$
  • C
    $\frac{{\text{x}}}{{\text{m}}} = \frac{{\text{k}}}{{{{\text{C}}^{{\text{1/n}}}}}}$
  • D
    $\frac{{\text{m}}}{{\text{x}}} = {\text{k}}{{\text{C}}^{{\text{1/n}}}}$
13
Which physical quantity remain unaffected when a reversible reaction is carried out in presence of a catalyst
  • A
    Pressure
  • B
    Temperature
  • C
    Equilibrium constant
    Correct
  • D
    Entropy
14
Which step of enzyme catalysis mechanism is shown in figure?
Question 14 figure 1
  • A
    Binding of enzyme to substrate to form product
  • B
    Decomposition of substrate to form product
  • C
    Binding of enzyme to substrate to form an activated complex
    Correct
  • D
    Decomposition of the activated complex to form products
15
Which of the following statement is true about Langmuir’s adsorption?
  • A
    It occurs at low temperature
  • B
    It has a reversible temperature
  • C
    It is not specific in nature
  • D
    It forms a monolayer
    Correct