Chapter 2
Structure of Atom
1.which of the following set of quantum number is not possible for an electron in the ground state of an atom with atomic number 19
a.n=2,l=0,m=0
b.n=3,l=2,m=2
c.n=2, l=1,m=0
d.n=3, l=1,1=0
Ans:- b.n
2.which is the element with electronic configuration of its atom 1s2 2s2 2p6 3s2 3d10 4s1
Ans:- V
3.The observation that the ground state of nitrogen atom has 3 unpaid electron in its electronic configuration and not otherwise is associated with a. Paul's exclusive principle
Ans:-Hund's rule of maximum multiplicity
4.The quantum number n=2, l=1 represent
a.2p orbital
b.1s orbital
C.3d orbital
d.3s orbital
Ans:-2p orbital
5.Two electron in the same atomic orbital can be distinguished by their
a. Principle quantum number
b.azimuthal quantum number
C.spin quantum number
d.magnetic quantum number
Ans:- spin quantum number
6.what is the maximum number of electrons in an atom that can have the following quantum number n=4 ,m=1,? n=4,m=1
Ans:- 6
7."The total number of orbitals in a shell having principal quantum n is 2n* "state whether this statement is true or false?
Ans:- False. The total number of orbital in a shell having principal quantum n is n2
8.Observe the relationship between the first two terms and fill in the blanks
a.Principal quantum number: Energy- and size of orbital
b.azimuthal quantum number:
Ans:shape of the orbital
9.A 4f orbital has
a. One node
b.two nodes
C.four nodes
d.three nodes
Ans:-three nodes
10.Orbitals angular momentum depends on
a.l
b.n and l
c.n and m
d n and S
Ans:- l
11.The shapes of two orbitals are given as follows
Write the azimuthal and magnetic quantum number of both.
Ans:- i)1=0 m=0,'l' refers to azimuthal and 'm' to magnetic quantum number
ii) l= 1, 1= -1 , 0,+1
12. Electromagnetic radiation has dual character, particle character as well as wave character. Name two phenomenon each to justify the particle and wave nature
Ans:- Reflection and refraction explained by particle nature of electromagnetic radiation. Differation and interference explained by wave of electromagnetic radiation
13. The atomic number of an element is derived from
Ans:- number of photos
14.Obseve the following radiations
IR rays, sound waves, Radio waves and x rays.find the which is not electromagnetic
Ans:- Sound wave is not an electromagnetic waves are associated with oscillating electric and magnetic character
15. Give the maximum number of electrons that can be accommodate in:
I. n= 4
ii.2p orbital
Ans:- i)n= 4 no of electron = 2n= 2×16 =32
ii)An orbital can accommodate maximum 2 electrons.
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Structure of Atom
1.which of the following set of quantum number is not possible for an electron in the ground state of an atom with atomic number 19
a.n=2,l=0,m=0
b.n=3,l=2,m=2
c.n=2, l=1,m=0
d.n=3, l=1,1=0
Ans:- b.n
2.which is the element with electronic configuration of its atom 1s2 2s2 2p6 3s2 3d10 4s1
Ans:- V
3.The observation that the ground state of nitrogen atom has 3 unpaid electron in its electronic configuration and not otherwise is associated with a. Paul's exclusive principle
Ans:-Hund's rule of maximum multiplicity
4.The quantum number n=2, l=1 represent
a.2p orbital
b.1s orbital
C.3d orbital
d.3s orbital
Ans:-2p orbital
5.Two electron in the same atomic orbital can be distinguished by their
a. Principle quantum number
b.azimuthal quantum number
C.spin quantum number
d.magnetic quantum number
Ans:- spin quantum number
6.what is the maximum number of electrons in an atom that can have the following quantum number n=4 ,m=1,? n=4,m=1
Ans:- 6
7."The total number of orbitals in a shell having principal quantum n is 2n* "state whether this statement is true or false?
Ans:- False. The total number of orbital in a shell having principal quantum n is n2
8.Observe the relationship between the first two terms and fill in the blanks
a.Principal quantum number: Energy- and size of orbital
b.azimuthal quantum number:
Ans:shape of the orbital
9.A 4f orbital has
a. One node
b.two nodes
C.four nodes
d.three nodes
Ans:-three nodes
10.Orbitals angular momentum depends on
a.l
b.n and l
c.n and m
d n and S
Ans:- l
11.The shapes of two orbitals are given as follows
Write the azimuthal and magnetic quantum number of both.
Ans:- i)1=0 m=0,'l' refers to azimuthal and 'm' to magnetic quantum number
ii) l= 1, 1= -1 , 0,+1
12. Electromagnetic radiation has dual character, particle character as well as wave character. Name two phenomenon each to justify the particle and wave nature
Ans:- Reflection and refraction explained by particle nature of electromagnetic radiation. Differation and interference explained by wave of electromagnetic radiation
13. The atomic number of an element is derived from
Ans:- number of photos
14.Obseve the following radiations
IR rays, sound waves, Radio waves and x rays.find the which is not electromagnetic
Ans:- Sound wave is not an electromagnetic waves are associated with oscillating electric and magnetic character
15. Give the maximum number of electrons that can be accommodate in:
I. n= 4
ii.2p orbital
Ans:- i)n= 4 no of electron = 2n= 2×16 =32
ii)An orbital can accommodate maximum 2 electrons.
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