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Chemistry Test 76

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Chemistry Test 76
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Weekly Quiz Competition
  • Question 1
    4 / -1

    For preparing a buffer solution of pH6 by mixing sodium acetate and acetic acid, the ratio of the concentrations of salt and acid should be (Ka = 10-5)

    Solution

     

     

  • Question 2
    4 / -1

    The final product in the following reaction will be a _______.

    Solution

    Reaction with aldehydes to form secondary alcohols  

    Acid is added in the second step to protonate the negatively charged oxygen.

    Hence, the correct option is (B).

     

  • Question 3
    4 / -1

    Which of the following options is incorrect about physical adsorption?

    Solution

    Physical adsorption is also known as physisorption. It is due to weak Van der Waals forces between adsorbate and adsorbent.

    This type of adsorption is caused by physical forces.

    Physisorption is a weak phenomenon.

    This adsorption is a multi-layered process.

    Physical adsorption is not specific and takes place all over the adsorbant.

    Surface area, temperature, pressure, nature of adsorbate effects physisorption.

    Energy for activation is low (20 – 40 kg/mol).
    Hence, the correct option is (C).

     

  • Question 4
    4 / -1

    Which one is known as a fusion mixture?

    Solution

    A fusion mixture consists of sodium salt and potassium salt. Generally, a mixture of potassium carbonate and sodium carbonate is used. It is called a fusion mixture because it is fused with a sample of the organic compounds to test for various groups.

    Hence, the correct option is (D).

     

  • Question 5
    4 / -1

    A gas is compressed isothermally to half its initial volume. The same gas is compressed separately through an adiabatic process until its volume is again reduced to half. Then,

    Solution

    From the graph, we can see that for compression of gas, area under the curve for adiabatic is more than isothermal process.

    Therefore, compressing the gas through adiabatic process will require more work to be done.

    Hence, the correct option is (C).

     

  • Question 6
    4 / -1

    Calcium cyanamide reacts with steam to form ammonia and

    Solution

    CaCN2+3H2O → CaCO3+2NH3

    Ammonia is also prepared synthetically by the cyanamide process: nitrogen gas combines with calcium carbide, CaC2, at high temperatures to form calcium cyanamide, CaCN2, and carbon; the calcium cyanamide reacts with steam to form calcium carbonate, CaCO3, and ammonia.

    Hence, the correct option is (A).

     

  • Question 7
    4 / -1

    Which of the following is a pair of π acceptor ligands?

    Solution

    The π-acceptor ligands are ethylene, cyclic π-systems such as cyclopentadiene and carbonyls etc. Ligands having empty orbitals that can interact with metal d-orbitals for the formation of π-bond are called π-acceptor ligands.

    Hence, the correct option is (A).

     

  • Question 8
    4 / -1

    A hypothetical reaction A → 2B proceeds through the following sequence of steps:

    The heat of reaction is

    Solution

     

  • Question 9
    4 / -1

    The rate constant, the activation energy and the Arrhenius parameter of a chemical reaction at 25oC are 3.0×10−4 s-1, 104.4kJmol−1 and 6.0×1014s−1 respectively. The value of the rate constant as T→∞ is:

    Solution

    K=3×10−4s−1

    Ea=104.4 KJ/mole

    A=6×1015s−1

    as T→∞;logK=logA−(2a/2.303 RT)

    logK=logA

    K=A=6×1014s−1

    Hence, the correct option is (A).

     

  • Question 10
    4 / -1

    Which of the following compounds is not a food additive?

    Solution

    Norethisterone, also known as norethindrone and sold under many brand names, is a progestin medication used in birth control pills, menopausal hormone therapy, and for the treatment of gynecological disorders.

    Hence, the correct option is (B).

     

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