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Structure of Atom

The document contains a series of questions related to Bohr's theory of the hydrogen atom, including energy transitions between states, ionization energy, and the ratios of radii and energies of different orbits. It also poses questions about the frequency of emitted radiation and the characteristics of hypothetical atomic spectra. The questions are designed to test knowledge of atomic structure and quantum mechanics principles.

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7 views2 pages

Structure of Atom

The document contains a series of questions related to Bohr's theory of the hydrogen atom, including energy transitions between states, ionization energy, and the ratios of radii and energies of different orbits. It also poses questions about the frequency of emitted radiation and the characteristics of hypothetical atomic spectra. The questions are designed to test knowledge of atomic structure and quantum mechanics principles.

Uploaded by

iamnaomuan05
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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Q1.

According to Bohr’s theory the energy required for the transition of H-atom from n=6 to
n=8 state is:
A. Equal to the energy required for the transition from n=5 to n=7 state
B. larger than in (A)
C. less than in (A)
D. equal to the energy required for the transition from n=7 to n=9 state.

Q2. The energy of the electron in an orbit of hydrogen atom is given by


−1311.8 −1
En = 2
kJ mol
n
The ionisation energy of hydrogen atom is –
a) 1311.8 kJ/mol b. -327.9 kJ/mol c. 145.7 kJ/mol d. -1311.8 kJ/mol

Q3. The ratio of the radius of Bohr first orbit for the electron orbiting the hydrogen nucleus to
that of the electron orbiting the deuterium nucleus (mass nearly twice that of H-nucleus) is
approximately is –
a) 1: 1 b) 1: 2 c) 2:1 d) 1:4

Q4. The ratio of radius of first three Bohr orbits of H-atom is:
a) 1:2:3 b) 1:4:9 c) 1:3:27 d) 1: 2: 3

Q5. The energy of an electron in the second Bohr orbit of H-atom is -E. The energy of the
electron in the Bohr’s first orbit is:
a) -E/4 b) -4E c) 4E d) -2E

Q6. The energy of the second Bohr orbit of H-atom is -3.41 eV. The energy of the second
Bohr orbit of He+ ion is:
a) -0.85 eV b) -1.70 eV c) -6.82 eV d) -13.64 eV

Q7. The frequency of radiations emitted when electrons fall from n=4 to n=1 in H-atom
would be – (given E1 for H= -2.1810-18 J/atom and h=6.62510-34 Js)
a) 1.54  10-18 s-1 b) 1.03  10-18 s-1 c) 3.08  10-18 s-1 d) 2.0  10-18 s-1
Q8. The energy of second Bohr’s orbit in H-atom is -328 kJ/mol, hence the energy of fourth
Bohr’s orbit would be-
a) -82 kJ/mol b) -41 kJ/mol c) -1312 kJ/mol d) -164 kJ/mol

Q9. Calculate the radius of Bohr’s 3rd orbit in Li2+ atom


Q10. Calculate the velocity (cm/sec) of an electron placed in the 3rd orbit of hydrogen atom.
Also calculate the number of revolutions per second that this electron makes around the
nucleus.
Q11. Suppose that a hypothetical atom gives red, green, blue and violet spectrum. Which
jump would give the red spectral line?
a) 31 b) 21 c) 41 d) 32

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