Structure of Atom Practice Questions - DPP for JEE

 Page 1


PART-I (Single Correct MCQs)
1. Among the following groupings which represents the collection of
isoelectronic species?
(a)
(b)
(c)
(d)
2. The compound in which cation is isoelectronic with anion is :
(a) NaCl
(b) CsF
(c) NaI
(d) K
2
S
Page 2


PART-I (Single Correct MCQs)
1. Among the following groupings which represents the collection of
isoelectronic species?
(a)
(b)
(c)
(d)
2. The compound in which cation is isoelectronic with anion is :
(a) NaCl
(b) CsF
(c) NaI
(d) K
2
S
3. The frequency of light emitted for the transition n = 4 to n = 2 of the
He
+
 is equal to the transition in H atom corresponding to which of the
following ?
(a) n = 2 to n = 1
(b) n = 3 to n = 2
(c) n = 4 to n = 3
(d) n = 3 to n = 1
4. In hydrogen atomic spectrum, a series limit is found at 12186.3 cm
–1
.
Then it belong to
(a) Lyman series
(b) Balmer series
(c) Paschen series
(d) Brackett series
5. Two fast moving particles X and Y are associated with de Broglie
wavelengths 1 nm and 4 nm respectively. If mass of X is nine times the
mass of Y, the ratio of kinetic energies of X and Y would be
(a) 3 : 1
(b) 9 : 1
(c) 5 : 12
(d) 16 : 9
6. The ratio of magnetic moments of Fe(III) and Co(II) is
(a) 7 : 3
(b) 3 : 7
(c) : 
Page 3


PART-I (Single Correct MCQs)
1. Among the following groupings which represents the collection of
isoelectronic species?
(a)
(b)
(c)
(d)
2. The compound in which cation is isoelectronic with anion is :
(a) NaCl
(b) CsF
(c) NaI
(d) K
2
S
3. The frequency of light emitted for the transition n = 4 to n = 2 of the
He
+
 is equal to the transition in H atom corresponding to which of the
following ?
(a) n = 2 to n = 1
(b) n = 3 to n = 2
(c) n = 4 to n = 3
(d) n = 3 to n = 1
4. In hydrogen atomic spectrum, a series limit is found at 12186.3 cm
–1
.
Then it belong to
(a) Lyman series
(b) Balmer series
(c) Paschen series
(d) Brackett series
5. Two fast moving particles X and Y are associated with de Broglie
wavelengths 1 nm and 4 nm respectively. If mass of X is nine times the
mass of Y, the ratio of kinetic energies of X and Y would be
(a) 3 : 1
(b) 9 : 1
(c) 5 : 12
(d) 16 : 9
6. The ratio of magnetic moments of Fe(III) and Co(II) is
(a) 7 : 3
(b) 3 : 7
(c) : 
(d) : 
7. The values of  Planck’s constant is 6.63 × 10
–34
 Js. The velocity of light
is 3.0 × 10
8
 m s
–1
. Which value is closest to the wavelength in
nanometres of a quantum of light with frequency of 8 × 10
15
 s
–1
?
(a) 5 × 10
–18
(b) 4 × 10
1
(c) 3 × 10
7
(d) 2 × 10
–25
8. Li and a proton are accelerated by the same potential, their de Broglie
wavelengths ?
Li
 and ?
p
 have the ratio (assume m
Li
 = 9m
p
)
(a) 1 : 2
(b) 1 : 4
(c) 1 : 1
(d)
9. If uncertainty in position and momentum are equal, then uncertainty in
velocity is :
(a)
(b)
(c)
(d)
10. Ionisation energy of He
+
 is 19.6 × 10
–18
 J atom
–1
. The energy of the first
stationary state (n = 1) of Li
2+
 is
Page 4


PART-I (Single Correct MCQs)
1. Among the following groupings which represents the collection of
isoelectronic species?
(a)
(b)
(c)
(d)
2. The compound in which cation is isoelectronic with anion is :
(a) NaCl
(b) CsF
(c) NaI
(d) K
2
S
3. The frequency of light emitted for the transition n = 4 to n = 2 of the
He
+
 is equal to the transition in H atom corresponding to which of the
following ?
(a) n = 2 to n = 1
(b) n = 3 to n = 2
(c) n = 4 to n = 3
(d) n = 3 to n = 1
4. In hydrogen atomic spectrum, a series limit is found at 12186.3 cm
–1
.
Then it belong to
(a) Lyman series
(b) Balmer series
(c) Paschen series
(d) Brackett series
5. Two fast moving particles X and Y are associated with de Broglie
wavelengths 1 nm and 4 nm respectively. If mass of X is nine times the
mass of Y, the ratio of kinetic energies of X and Y would be
(a) 3 : 1
(b) 9 : 1
(c) 5 : 12
(d) 16 : 9
6. The ratio of magnetic moments of Fe(III) and Co(II) is
(a) 7 : 3
(b) 3 : 7
(c) : 
(d) : 
7. The values of  Planck’s constant is 6.63 × 10
–34
 Js. The velocity of light
is 3.0 × 10
8
 m s
–1
. Which value is closest to the wavelength in
nanometres of a quantum of light with frequency of 8 × 10
15
 s
–1
?
(a) 5 × 10
–18
(b) 4 × 10
1
(c) 3 × 10
7
(d) 2 × 10
–25
8. Li and a proton are accelerated by the same potential, their de Broglie
wavelengths ?
Li
 and ?
p
 have the ratio (assume m
Li
 = 9m
p
)
(a) 1 : 2
(b) 1 : 4
(c) 1 : 1
(d)
9. If uncertainty in position and momentum are equal, then uncertainty in
velocity is :
(a)
(b)
(c)
(d)
10. Ionisation energy of He
+
 is 19.6 × 10
–18
 J atom
–1
. The energy of the first
stationary state (n = 1) of Li
2+
 is
(a) 4.41 × 10
–16
 J atom
–1
(b) –4.41 × 10
–17
 J atom
–1
(c) –2.2  × 10
–15
 J atom
–1
(d) 8.82 × 10
–17
 J atom
–1
11. The kinetic energy of an electron in the second Bohr orbit of a
hydrogen atom is [a
0
 is Bohr radius] :
(a)
(b)
(c)
(d)
12. If the nitrogen atom had electronic configuration 1s
7
 it would have
energy lower than that of the normal ground state configuration 1s
2
 2s
2
2p
3
 because the electrons would be closer to the nucleus. Yet 1s
7
 is not
observed. It violates
(a) Heisenberg’s uncertainty principle
(b) Hund’s rule
(c) Pauli exclusion principle
(d) Bohr postulate of stationary orbits
13. In a hydrogen atom, if energy of an electron in ground state is 13.6. ev,
then that in the 2
nd
 excited state is
(a) 1.51 eV
(b) 3.4 eV
(c) 6.04 eV
Page 5


PART-I (Single Correct MCQs)
1. Among the following groupings which represents the collection of
isoelectronic species?
(a)
(b)
(c)
(d)
2. The compound in which cation is isoelectronic with anion is :
(a) NaCl
(b) CsF
(c) NaI
(d) K
2
S
3. The frequency of light emitted for the transition n = 4 to n = 2 of the
He
+
 is equal to the transition in H atom corresponding to which of the
following ?
(a) n = 2 to n = 1
(b) n = 3 to n = 2
(c) n = 4 to n = 3
(d) n = 3 to n = 1
4. In hydrogen atomic spectrum, a series limit is found at 12186.3 cm
–1
.
Then it belong to
(a) Lyman series
(b) Balmer series
(c) Paschen series
(d) Brackett series
5. Two fast moving particles X and Y are associated with de Broglie
wavelengths 1 nm and 4 nm respectively. If mass of X is nine times the
mass of Y, the ratio of kinetic energies of X and Y would be
(a) 3 : 1
(b) 9 : 1
(c) 5 : 12
(d) 16 : 9
6. The ratio of magnetic moments of Fe(III) and Co(II) is
(a) 7 : 3
(b) 3 : 7
(c) : 
(d) : 
7. The values of  Planck’s constant is 6.63 × 10
–34
 Js. The velocity of light
is 3.0 × 10
8
 m s
–1
. Which value is closest to the wavelength in
nanometres of a quantum of light with frequency of 8 × 10
15
 s
–1
?
(a) 5 × 10
–18
(b) 4 × 10
1
(c) 3 × 10
7
(d) 2 × 10
–25
8. Li and a proton are accelerated by the same potential, their de Broglie
wavelengths ?
Li
 and ?
p
 have the ratio (assume m
Li
 = 9m
p
)
(a) 1 : 2
(b) 1 : 4
(c) 1 : 1
(d)
9. If uncertainty in position and momentum are equal, then uncertainty in
velocity is :
(a)
(b)
(c)
(d)
10. Ionisation energy of He
+
 is 19.6 × 10
–18
 J atom
–1
. The energy of the first
stationary state (n = 1) of Li
2+
 is
(a) 4.41 × 10
–16
 J atom
–1
(b) –4.41 × 10
–17
 J atom
–1
(c) –2.2  × 10
–15
 J atom
–1
(d) 8.82 × 10
–17
 J atom
–1
11. The kinetic energy of an electron in the second Bohr orbit of a
hydrogen atom is [a
0
 is Bohr radius] :
(a)
(b)
(c)
(d)
12. If the nitrogen atom had electronic configuration 1s
7
 it would have
energy lower than that of the normal ground state configuration 1s
2
 2s
2
2p
3
 because the electrons would be closer to the nucleus. Yet 1s
7
 is not
observed. It violates
(a) Heisenberg’s uncertainty principle
(b) Hund’s rule
(c) Pauli exclusion principle
(d) Bohr postulate of stationary orbits
13. In a hydrogen atom, if energy of an electron in ground state is 13.6. ev,
then that in the 2
nd
 excited state is
(a) 1.51 eV
(b) 3.4 eV
(c) 6.04 eV
(d) 13.6 eV.
14. The limiting line in Balmer series will have a frequency of
(Rydberg constant, R
8
 = 3.29 × 10
15
 cycles/s)
(a) 8.22 × 10
14
 s
–1
(b) 3.29 × 10
15
 s
–1
(c) 3.65 × 10
14
 s
–1
(d) 5.26 × 10
13
 s
–1
15. If the radius of first orbit of H atom is a
0
, the de-Broglie wavelength of
an electron in the third orbit is
(a) 4pa
0
(b) 8pa
0
(c) 6pa
0
(d) 2pa
0
16. Which of the following radial distribution graphs correspond to l = 2
for the H atom ?
(a)
(b)
(c)