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Atomic Structure Test - 29
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Atomic Structure Test - 29

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  • Question 1/19
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    The electron in Bohr’s model of hydrogen atom is pictured as revolving around the nucleus in order for it to

    Solutions

    Revolving electrons possess energy.

  • Question 2/19
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    Given below are the spectral lines for an atom of hydrogen. Mark the lines which are not correctly matched with the value of n1 and n2?

    Solutions

    (ii) Balmer, n1 = 2 ; n2 = 3, 4 ; region - visible
    (iv) Pfund, n1 = 5 ; n2 = 6, 7; region - infrared

  • Question 3/19
    1 / -0

    What is the maximum number of emission lines when the excited electron of a hydrogen atom in n = 6 drops to ground state?

    Solutions

    Maximum number of emission lines

  • Question 4/19
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    What is the maximum number of emission lines obtained when the excited electron of a H atom in n = 5 drops to the ground state?

    Solutions

    Number of lines produced when electron from nth shell drops,to ground state is given by

  • Question 5/19
    1 / -0

    _____series of lines are the only lines in hydrogen spectrum which appear in the visible region.

    Solutions

    In Balmer series, the lines appear in visible region.

  • Question 6/19
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    An electron in excited hydrogen atom falls from fifth energy level to second energy level. In which of the following regions, the spectrum line will be observed and is part of which series of the atomic, spectrum?

    Solutions

    For Balmer series, n1 = 2, n2 = 3, 4,  5,....
    The spectral lines are seen in visible region.

  • Question 7/19
    1 / -0

    The third line of the Balmer series in the emission spectrum of the hydrogen atom is due to the transition from the

    Solutions

    Rydberg’s formula for calculation of wavenumbers of hues in hydrogen spectrum is

    For Balmer series, n1 = 2 and n2 = 3, 4, 5, so third line of the Balmer series is due to transition from fifth Bohr orbit to second Bohr orbit

  • Question 8/19
    1 / -0

    The angular momentum of an electron in a given stationary state can be expressed as . 
    Based on this expression an electron can move only in those orbits for which its angular momentum is?

    Solutions

    An electron can move only in those orbit for which angular momentum is a multiple of h/2π. n = 1,2,3,...

  • Question 9/19
    1 / -0

    According to Bohr’s theory, the angular momentum of an electron in 5th orbit is

    Solutions

  • Question 10/19
    1 / -0

    The radius of the stationary state which is also called Bohr radius is given by the expression rn = n2a0 where the value of a0 is

    Solutions

  • Question 11/19
    1 / -0

    If the radius of first Bohr orbit is x pm, then the radius of the third orbit would be

    Solutions

    r = x × n2 or (9 × x) pm

  • Question 12/19
    1 / -0

    What does the negative electronic energy (negative sign for all values of energy) for hydrogen atom means?

    Solutions

    The negative sign means that the energy of an electron iii an atom is lower than the energy of a free electron at rest. When electron-is free from the influence of nucleus, the energy is taken as zero. When the electron is attracted by the nucleus, the energy is emitted and lowered.

  • Question 13/19
    1 / -0

    If the ionisation energy of hydrogen atom is 13.6 eV, the energy required to excite it from ground state to the next higher state is approximately

    Solutions

  • Question 14/19
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    Bohr’s theory can also be applied to the ions like

    Solutions

    Bohr’s atomic theory is applicable to hydrogen and monoatomic ions like He+, Li2+, Be3+, etc.

  • Question 15/19
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    According to Bohr’s theory, the electronic energy of H-atom in Bohr’s orbit is given by

    Solutions

  • Question 16/19
    1 / -0

    Which of the following is not correctly matched? 

    Solutions

    Energy of 1 mole of photons 
    where N0 is Avogadro’s number, h = Planck’s constant, c is speed of light and λ is wavelength.

  • Question 17/19
    1 / -0

    What is the trend of energy of Bohr’s orbits?

    Solutions

    Energy of the orbit increases as we move away from the nucleus or as the value of n increases.

  • Question 18/19
    1 / -0

    The radius of hydrogen atom in ground state is 0.53 Å. What will be the radius of 3Li2+ in the ground state?

    Solutions

    Radius of orbit is given by

  • Question 19/19
    1 / -0

    What is the velocity of electron present in first Bohr orbit of hydrogen atom?

    Solutions

    From Bohr’s theory,

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