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Chemistry Test 90
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Chemistry Test 90

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  • Question 1/10
    4 / -1

    On adding AgNO3 solution into KI solution, a negatively charged AgI colloidal sol is obtained when they are in :-

    Solutions

    AgNO3 + KI → AgI + KNO3

    Sol

    ∵ for – ve sol AgI will adsorb I– from KI so mol of KI > AgNO3

     

  • Question 2/10
    4 / -1

    Arrange the following electrolytes in the increasing order of coagulation power for the coagulation of As2S3 sol :

    NaCl  CaCl2  SnCl4  AlCl3

      (I)       (II)       (III)    (IV)

  • Question 3/10
    4 / -1

    100 mL of 0.6 M acetic acid is shaken with 2 g activated carbon. The final concentration of the solution after adsorption is 0.5 M. What is the amount of acetic acid adsorbed per gram of carbon :-

    Solutions

    Mass of acetic acid adsorbed by 2 g charcol

    = 100 × 10–3 × (0.6 – 0.5) × 60

    ⇒ 0.6;  x/m = 0.6/2 ⇒ 0.3

     

  • Question 4/10
    4 / -1

    Gold number of a lyophilic sol is such a property that :

  • Question 5/10
    4 / -1

    In the form of dichromate, Cr+6 is a strong oxidising agent in acidic medium, but Mo+6 in MoO3 and W+6 in WO3 are not because:

    Solutions

    '+6' oxidation state of Mo and W is more stable as compared to Cr.

     

  • Question 6/10
    4 / -1

    Which compound exists?

    Solutions

    With I–, +1 oxidation state of Cu is more stable hence, K2[CuI4] does not exist. MnF4 and CrF6 exist but not MnF7 and CrF7.

     

  • Question 7/10
    4 / -1

    The part of the skin that comes in contact with nitric acid turns yellow because:

    Solutions

    Proteins of skin are converted into xanthoproteins when skin comes into the contact of HNO3.

     

  • Question 8/10
    4 / -1

    Gaseous products formed when Zn reacts with dil. H2SO4 and conc. H2SO4 respectively:

    Solutions

    Zn + dil. H2SO4  →  ZnSO4 + H2­↑

    Zn + conc. H2SO4 → ZnSO4 + SO2↑­ + H2O

     

  • Question 9/10
    4 / -1

    Which of the following order is not correct?

    Solutions

    Correct order of bond dissociation energy is, Cl2 > Br2 > F2 > I2

     

  • Question 10/10
    4 / -1

    Which of the following can not be obtained by hydrolysis of XeF6 ?

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