Assignment
Q 1. Fill in the blanks.
(i)
The
number of radial nodes for 3p orbital is ----------.
(ii)
Number
of angular nodes for 4d orbital is ----------.
(iii)
Total
no of orbitals associated with third shell will be ------.
(iv)
Chlorine
exists in two isotopic forms, Cl-35 and Cl-37 but its atomic mass is 35.5. This
indicates the ratio of Cl-35 and Cl-37 is ---------.
(v)
Orbital
angular momentum depends on -------.
(vi)
The
total no of electrons having m=0 in Rb (atomic no. 37) -----.
(vii)
The
total no of nodes in 3s orbital is ---.
Q 2. Arrange s, p and d
sub-shells of a shell in the increasing order of effective nuclear charge ( Zeff
) experienced by the electron present in them.
Q 3. Show the Distribution of electrons in oxygen atom (atomic
no 8) using orbital diagram.
Q 4. Nickel atom can lose two electrons to form Ni2+ ion.
The atomic number of nickel is 28. From which orbital will nickel lose two
electrons?
Q 5. Which of the following orbitals are degenerate? 3dxy
,4dxy , 3dz2,
4dyz, 4 dz2.
Q 6. Which of the following not show deflection from the path
on passing through an electric field?
Proton, cathode
rays, electron, neutron.
Q 7. Wave lengths of different radiations are given below:
A=300nm, B = 300µm,
C = 3nm, D =30 Å. Arrange these radiations in the increasing order of their
energies.
Q8. Match the
following rules with their statements:
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RULES
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STATEMENTS
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(i)
Hund’s Rule
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(a)
No two
electrons in an atom can have the same set of four quantum numbers.
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(ii)
Aufbau
principle
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(b)
Half-filled and
completely filled orbitals have extra stability.
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(iii)
Pauli Exclusion
principle
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(c
) Pairing of electrons in the orbital
belonging to the same subshell does not take place until each orbital is
singly occupied.
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(iv)
Heisenberg ‘s
uncertainty principle
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(d)
It is
impossible to determine the exact position and exact momentum of a subatomic
particle simultaneously.
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(e) In
the ground state of atoms, orbitals are filled in the order of their
increasing energies.
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Q9. Two particles A and B are in motion. If the wavelength
associated with particle A is 5x10-8m calculate the wavelength associated
with particle B if its momentum is half of A.
Q10. A moving electron has 4.55x10-25 J .What will
be the wavelength of electron?
(Mass of electron = 9.1x10-31 kg and h= 6.6x10-34js).
Q11. Draw the shapes of the s, p and d orbitals and label it.
Q12. What is the angular momentum of an electron in (i) 2s orbital
(ii) 4f orbital?
Q13. Calculate the wavelength for the emission transition if
it starts from the orbit having radius1.3225 nm and ends at 211.6 pm. Name the
series to which this transition belong and the region of the spectrum.
Q14. Indicate the no of unpaired electron in (a) P (b) Co (c)
Cr (d) Fe (e) Rb .
Q15. With what velocity must an electron travel so that its
momentum is equal to that of a photon of wavelength 560 nm?
