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Published on: 24/08/2019
Quantum Mechanical Model of Atom
Download Tamil Nadu 11th Standard Chemistry question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
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Take MCQ Chemistry Test
1.
Electronic configuration of species M2+ is 1s2 2s2 2p6 3s2 3p6 3d6 and its atomic weight is 56. The number of neutrons in the nucleus of species M is ________
26
22
30
24
2.
Which of the following particle having same kinetic energy, would have the maximum de-Broglie wave length
α-particle
proton
β-particle
neutron
3.
The value of Bohr radius for hydrogen atom is ___________
0.529 \(\times\) 10-8 cm
0.529 \(\times\) 10-10 cm
0.529 \(\times\) 10-12 cm
0.529 \(\times\) 10-12 cm
4.
de-Broglie equation is __________
λ = mv/h
λ = hmv
λ = hv/m
λ = h/mv
5.
Dual character of an electron was explained by ____________
Bohr
Heisenberg
de-Broglie
Pauli
6.
If En = -313.6/n2,If the value of Ei = -34.84 to which value 'n' corresponds __________
4
3
2
1
7.
Which of the following properties of atom could be explained correctly by Thomson model of an atom?
Overall neutrality of atom.
Spectra of hydrogen atom.
Position of protons, electrons and neutrons in atom .
Stability of atom.
8.
Which of the following about the electron is incorrect?
It is a negatively charged particle.
The mass of electron is equal to the mass of neutron .
It is a basic constituent of all the atoms
electron mass = 9.10938356 x 10-31kilograms
9.
Which of the following conclusions could not be derived from Rutherford's \(\alpha\)-particle scattering experiment?
Most of the space in the atom is empty.
The radius of the atom is about 10-10 m while that of the nucleus is 10-15 m
Electrons move in a circular path of fixed energy called orbits.
Nucleus and the electrons are held together by electrostatic force of attraction
10.
6C14 and 7N14 are _____________
isotones
isoelectronic
isobars
isotopes
11.
Neutron was discovered by ________
Rutherford
Chadwick
Bohr
Thomson
12.
The fixed circular paths around the nucleus are caused ____
orbits
Orbitals
nucleons
Mesons
13.
Mass number is equal to the ________
number of protons + number of electrons
number of protons + number of neutrons
number of neutrons + number of electrons
number of electrons
14.
The atomic number of an element is 17 and its mass number is 37. The number of protons, electrons and neutrons present in the neutral atom are __________
17,37,20
20,17,37
17,17,20
17,20,17
37,20,17.
15.
The nucleus of an atom contains
Electrons and protons
Neutrons and protons
Electrons, protons and neutrons
Neutrons and electrons
16.
J. J. Thomson's cathode ray experiment revealed that atoms consist of _____________
electrons
protons
neutrons
photons
17.
Which of the following does not represent the mathematical expression for the Heisenberg uncertainty principle?
\(\triangle x.\triangle p\ge \frac { h }{ 4\pi } \)
\(\triangle x.\triangle v\ge \frac { h }{ 4\pi m } \)
\(\triangle E.\triangle t\ge \frac { h }{ 4\pi } \)
\(\triangle E.\triangle x\ge \frac { h }{ 4\pi } \)
18.
If uncertainty in position and momentum are equal, then minimum uncertainty in velocity is _________
\(\frac { 1 }{ m } \sqrt { \frac { h }{ \pi } } \)
\( \sqrt { \frac { h }{ \pi } } \)
\(\frac { 1 }{ 2m } \sqrt { \frac { h }{ \pi } } \)
\( { \frac { h }{4\pi } } \)
19.
Electron density in the yz plane of 3dxy orbital is ___________
zero
0.50
0.75
0.90
20.
How many electrons in an atom with atomic number 105 can have (n + 1) = 8 ?
30
17
15
unpredictable
21.
Which of the following has maximum number of unpaired d-electrons?
N3+
Fe2+
Zn+
Cu+
22.
Which one of the following orbitals is spherical in shape?
4s
3p
3d
4f
23.
How many nodes are possible for 2s orbital?
1
2
3
zero
24.
For d-electron, the orbital angular momentum is ___________
\(\frac { \sqrt { 2 } h }{ 2\pi } \)
\(\\ \frac { \sqrt { 2h } }{ 2\pi } \)
\(\frac { \sqrt { 2\times 4 } h }{ 2\pi } \)
\(\frac { \sqrt { 6 } h }{ 2\pi } \)
25.
Two electrons occupying the same orbital are distinguished by ___________
azimuthal quantum number
spin quantum number
magnetic quantum number
orbital quantum number
26.
The electronic configuration of Eu (Atomic no. 63) Gd (Atomic no. 64) and Tb (Atomic no. 65) are ____________
[Xe] 4f6 5d1 6s2, [Xe] 4f7 Sd1 6s2 and [Xe] 4f8 5d1 6s2
[Xe] 4f7 , 6s2, [Xe] 4f7 5d1 6s2 and [Xe] 4f9 6s2
[Xe] 4f7 ,6s2, [Xe] 4f8 6s2 and [Xe] 4f8 5d1 6s2
[Xe] 4f6 5d1 6s2, [Xe] 4f7 5d1 6s2 and [Xe] 4f9 6s2
27.
Splitting of spectral lines in an electric field is called _____________
Zeeman effect
Shielding effect
Compton effect
Stark effect
28.
The energies E1and E2 of two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths ie \(\lambda \)1 and\(\lambda \)2 will be ___________
\(\frac { { \lambda }_{ 1 } }{ { \lambda }_{ 2 } } =1\)
\({ \lambda }_{ 1 }=2{ \lambda }_{ 2 }\)
\({ \lambda }_{ 1 }=\sqrt { 25\times 50{ \lambda }_{ 2 } } \)
\(2{ \lambda }_{ 1 }={ \lambda }_{ 2 }\)
29.
The energy of light of wavelength 45 nm is _____________.
6.67 x 1015J
6.67 x 1011J
4.42 x 10-18J
4.42 x 10-15J
1.
(c)
30
2.
(c)
β-particle
3.
(a)
0.529 \(\times\) 10-8 cm
4.
(d)
λ = h/mv
5.
(c)
de-Broglie
6.
(b)
3
7.
(a)
Overall neutrality of atom.
8.
(b)
The mass of electron is equal to the mass of neutron .
9.
(c)
Electrons move in a circular path of fixed energy called orbits.
10.
(c)
isobars
11.
(b)
Chadwick
12.
(a)
orbits
13.
(b)
number of protons + number of neutrons
14.
(c)
17,17,20
15.
(b)
Neutrons and protons
16.
(a)
electrons
17.
(d)
\(\triangle E.\triangle x\ge \frac { h }{ 4\pi } \)
18.
(c)
\(\frac { 1 }{ 2m } \sqrt { \frac { h }{ \pi } } \)
19.
(a)
zero
20.
(b)
17
21.
(b)
Fe2+
22.
(a)
4s
23.
(a)
1
24.
(d)
\(\frac { \sqrt { 6 } h }{ 2\pi } \)
25.
(b)
spin quantum number
26.
(b)
[Xe] 4f7 , 6s2, [Xe] 4f7 5d1 6s2 and [Xe] 4f9 6s2
27.
(d)
Stark effect
28.
(b)
\({ \lambda }_{ 1 }=2{ \lambda }_{ 2 }\)
29.
(c)
4.42 x 10-18J
11th Standard Syllabus & Materials
11th Standard
TN 11th Tamil பீடு பெற நில் - செய்யுள் - காவடிச்சிந்து Important Questions And Answers Study Material - QB365 Set A
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TN 11th Tamil பீடு பெற நில் - உரைநடை - மலை இடப்பெயர்கள் : ஓர் ஆய்வு Important Questions And Answers Study Material - QB365 Set A
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TN 11th Tamil மாமழை போற்றுதும் - துணைப்பாடம் - யானை டாக்டர் Important Questions And Answers Study Material - QB365 Set A
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TN 11th Tamil மாமழை போற்றுதும் - செய்யுள் - ஐங்குறுநூறு Important Questions And Answers Study Material - QB365 Set A
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