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Chemistry Test - 11
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Chemistry Test - 11
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  • Question 1/10
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    The correct order of bond energies of the following bonds is:

    (I) C(sp3)-C(sp3), (II) C(sp2)-C(sp2), (III) C(sp)-C(sp)
    Solutions

    I < II < III

  • Question 2/10
    1 / -0

    A catalyst is added to a reaction to increase the rate of reaction. Which of the following statements is correct?
    Solutions

    A catalyst provides an alternate pathway or reaction mechanism.

  • Question 3/10
    1 / -0

    Directions: Match the order of the reaction from column - I with the reaction characteristics from column - II in the following table.

    Column I Column II
    (A) Zero-order reaction (a) High activation energy
    (B) Pseudo unimolecular reaction (b) Decreases activation energy
    (C) Slow reaction (c) Decomposition of ammonia on tungsten
    (D) Positive catalyst (d) Hydrolysis of cane sugar

     

     

    Solutions

    (A) - (c), (B) - (d), (C) - (a), (D) - (b)

  • Question 4/10
    1 / -0

    Directions: The following question has four choices out of which ONLY ONE is correct.

    The experimental data for the reaction 2A + B22AB is given in the table below:

     

    Experiment [A] [B2] Rate (mole s -1)
    1 0.50 0.50 1.6 ×10–4
    2 0.50 1.00 3.2 ×10–4
    3 1.00 1.00 3.2 ×10–4

     

    The rate equation for the above data is

     

    Solutions

    rate = k[B2]

  • Question 5/10
    1 / -0

    We wish to see inside an atom. Assume the atom to have a diameter of 100 pm. This means that one must be able to resolve a width of say 10 pm. If an electron microscope is used, the energy required should be
    Solutions

    Correct option is 15 keV.

  • Question 6/10
    1 / -0

    The half-life of 131I is 8 days. If we have a sample of 131I at time t = 0, we can assert that

    Solutions

    a given nucleus may decay any time after t = 0

  • Question 7/10
    1 / -0

    A radioactive nuclide can decay simultaneously by two different processes, which have individual decay constants λ1 and λ2. The effective decay constant of the nuclide ( λ ) is given by

    Solutions

    λ=λ1+λ2

  • Question 8/10
    1 / -0

    The binding energies for nuclei 1H1, 2He426Fe56 and 92U235 are 2.22, 28.3, 492 and 17.86 MeV, respectively. The most stable nucleus is
    Solutions

    The most stable nucleus is26Fe56

  • Question 9/10
    1 / -0

    The binding energy per nucleon of 1H2 is 1.1 MeV and binding energy per nucleon of 2He4 is 7 MeV. The energy released when two 1H2 combine to form 2He4 is
    Solutions

    23.6 MeV

  • Question 10/10
    1 / -0

    For a certain radioactive substance, it is observed that after 4 hours, only 6.25% of the original sample is left undecayed. Which of the following statements is incorrect?
    Solutions

    Correct Answer : The mean life of the sample is 1/2 hr.

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