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12th Standard Chemistry Surface Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021

12th Standard

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Chemistry

Time : 00:20:00 Hrs
Total Marks : 20
    Answer all the questions
    20 x 1 = 20
  1. 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

  2. Fog is colloidal solution 0 of

    (a)

    solid in gas

    (b)

    gas in gas

    (c)

    liquid in gas

    (d)

    gas in liquid

  3. Statement :
    To stop bleeding from an injury, ferric chloride can be applied. Which comment about the statement is justified?

    (a)

    It is not true, ferric chloride is a poison.

    (b)

    It is true, Fe3+ ions coagulate blood which is a negatively charged sol

    (c)

    It is not true; ferric chloride is ionic and gets into the blood stream.

    (d)

    It is true, coagulation takes place because of formation of negatively charged sol with Cl-.

  4. Which one of the is not a surfactant?

    (a)

    CH3 -(CH2)15 -N -(CH3)2 CH2Br

    (b)

    CH3 -(CH2)15 -NH2

    (c)

    CH3 -(- CH2- )-16CH2 OSO2- Na+

    (d)

    OHC-(CH2)14 -CH2 -COO- Na+

  5. Which one of the following is an example for homogeneous catalysis?

    (a)

    manufacture of ammonia by Haber’s process

    (b)

    manufacture of sulphuric acid by contact process

    (c)

    hydrogenation of oil

    (d)

    Hydrolysis of sucrose in presence of all HCl

  6. The coagulation values in millimoles per litre of the electrolytes used for the coagulation of AS2S3 are given below
    (I) (NaCl)=52 (II) ((BaCl2)=0.69 (III) (MgSO4)=0.22
    The correct order of their coagulating power is

    (a)

    III > II > I

    (b)

    I > II > III

    (c)

    I > III > II

    (d)

    II > III>I

  7. Match the following

    a Pure nitrogen i Chlorine
    b Haber process ii Sulphuric acid
    c Contact process iii Ammonia
    d Deacons Process iv sodium azide (or) Barium azide

    Which of the following is the correct option?

    (a)
    A B C D
    i ii iii iv
    (b)
    A B C D
    ii iv i iii
    (c)
    A B C D
    iii iv ii i
    (d)
    A B C D
    iv iii ii i
  8. Which among the following does not affect adsorption?

    (a)

    surface area of the adsorbent

    (b)

    catalyst

    (c)

    temperature

    (d)

    pressure

  9. Which of the following is true regarding Freundlich adsorption isotherm equation?

    (a)

    Purely empirical

    (b)

    Valid only over a limited pressure range

    (c)

    The value of constants k and n varies with temperature

    (d)

    All the above

  10. Adsorption is accompanied by

    (a)

    decrease in free energy

    (b)

    increase in free energy

    (c)

    increase in entropy

    (d)

    both (b) and (c)

  11. Which among the following reactions is an example of auto catalysis?
    i) CH3COOC2H5+H2O➝ CH3COOH+C2H5OH
    ii) 2H2O➝2H2O+O2
    iii) 2SO2+O2➝2SO3
    iv) 2AsH3➝2As+3H2

    (a)

    only (i)

    (b)

    (i) and (ii)

    (c)

    (i) and (ii)

    (d)

    (i) and (iv)

  12. The intermediate compound formation theory does not explain

    (a)

    action of catalytic poison

    (b)

    specificity of a catalyst

    (c)

    the mechanism of heterogeneous catalysed reactions

    (d)

    both (a) and (c)

  13. Which one of the following is correctly matched?

    (a)

    Emulsion - Mayonnaise

    (b)

    Foam - Cream

    (c)

    Solid aerosol - Fog

    (d)

    Solid sol - Pumice stone

  14. Which among the following is/are solid aerosol?
    (i) Dust
    (ii) Fog
    (iii) Aerosol spray
    (iv) Air

    (a)

    (i) and (iv)

    (b)

    (iii) and (iv)

    (c)

    (i) and (iii)

    (d)

    only (iii)

  15. The phenomenon of Tyndall's effect is not observed in

    (a)

    emulsion

    (b)

    colloidal solution

    (c)

    true solution

    (d)

    none

  16. Colloidal medicines are more efffective because

    (a)

    they are clean

    (b)

    they are easy to prepare

    (c)

    the germs move towards them

    (d)

    they are easily assimilated and adsorbed

  17. Oil soluble dye is mixed with emulsion and emulsion remains colourless then, the emulsion is

    (a)

    O/W

    (b)

    W/O

    (c)

    O/O

    (d)

    W/W

  18. This adsorption is irreversible

    (a)

    Vanderwaal'sadsorption

    (b)

    Physical adsorption

    (c)

    Chemical adsorption

    (d)

    All the above

  19. Dispersed Phase Dispersion Medium Name
    Liquid X Liquid Aerosol
    Y Solid Solid form

    The X and Yare ______ and _____.

    (a)

    Gas, Liquid

    (b)

    Gas, Solid

    (c)

    Gas, Gas

    (d)

    Solid, Gas

  20. When the operation force between the absorbent and adsorbate is weak Vander waal's force, then it is called

    (a)

    physicaladsorption

    (b)

    chemicaladsorption

    (c)

    Vanderwaal'sadsorptio

    (d)

    both (a) and (c)

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