JEE Chemistry Structure of Atoms MCQs A

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MCQ for Full Syllabus Chemistry Structure of Atoms

Full Syllabus Chemistry students should refer to the following multiple-choice questions with answers for Structure of Atoms in Full Syllabus.

Structure of Atoms MCQ Questions Full Syllabus Chemistry with Answers

 

 
1. The first use of quantum theory to explain the structure of atom was made by –
 
(A) Heisenberg 
   
(B) Bohr   
 
(C) Plank   
 
(D) Einstein
 
2. Plum-Pulding model is known as–
 
(A) Rutherford Model
 
(B) Thomson's model
 
(C) Bohr Model
 
(D) All the above
 
3. Nucleous consist of–
 
(A) Proton and electron
 
(B) Proton and neutron
 
(C) Neutron and electron
 
(D) Only neutron
 
4. The number of valence electron in Na is –
 
(A) 1
 
(B) 2
 
(C) 3
 
(D) 4
 
5. Mass number of element is –
 
(A) Number of protons in its nucleus
 
(B) Number of electrons and protons in the atom
 
(C) Number of neutrons and protons in the nucleus
 
(D) Number of neutrons in the nucleus
 
6. According to the Dalton's atomic theory –
 
(A) Electrons, proton and neutron are found in atom
 
(B) Atom is indivisible
 
(C) Atom of various element have same properties
 
(D) Atoms are destroyed in the chemical reaction
 
7. Neutron is a fundamental particle which have–
 
(A) +1 unit charge and 1 unit mass
 
(B) No charge and 1 unit mass
 
(C) Have no charge and mass
 
(D) Have –1 unit charge and 1 unit mass
 
8. No. of unpaired electron in 1s2.2s2.2p4
 
(A) 4
 
(B) 2
 
(C) 0
 
(D) 1
 
9. The electron should be filled in the orbital in accordance with the increasing order of their energy. This statement is related with –
 
(A) Affbau principle
 
(B) Pauli principle
 
(C) Hund's principle
 
(D) Plank's rules
 
10. Which species does not contain neutron –
 
(A) H
 
(B) Li+2
 
(C) C
 
(D) 0
 
11. Which of the following electronic configuration does not obey aufbau principle –
 
12. Atomic number of any element–
 
(A) Atomic weight divided by two
 
(B) Number of neutron in nucleus
 
(C) Nucleus weight
 
(D) Nuclear charge
 
13. Lighest particle is –
 
(A) Neutron
 
(B) Electron
 
(C) Proton
 
(D) None of these
 
14. Fundamental particle of atomic nucleus is–
 
(A) p, e–
 
(B) p, n, e
 
(C) p, n
 
(D) n, e
 
15. The atomic size is nearly –
 
(A) 10–10cm
 
(B) 10–6m
 
(C) 10–7m
 
(D) 10–10m
 
16. An atom which has a mass number of 14 or 8 neutrons is–
 
(A) Isotope of oxygen
 
(B) Isotope of oxygen
 
(C) Isotope of carbon
 
(D) Isobar of carbon
 
17. Electronic configuration of p in ground state is –
 
(A) 1s22s22p6
 
(B) 1s22s22p63s23p3
 
(C) 1s22s22p63s23p23d1
 
(D) 1s22s22p63s2
 
18. When a gas at reduced pressure is subjected to an electric discharge, the rays orignating from the negative electrode are–
 
(A) Anode rays
 
(B) Cathode rays
 
(C) x-rays
 
(D) Radiation ray,
 
19. The maximum number of electrons that can be accomodate in the nth level is–
 
(A) n2
 
(B) 2n2
 
(C) 4n2
 
(D) n
 
20. Isotopes of an element are the atom which have –
 
(A) The same number of neutrons in their nuclei
 
(B) The same mass number
 
(C) Different number of electrons in their orbit
 
(D) The same number of proton in their nuclei
 
21. Number of valence electron in Ar are–
 
(A) 8
 
(B) 18
 
(C) 19
 
(D) 20
 
22. Rutherford's alpha-particle Scattering experiment was responsible for the discovery of–
 
(A) Proton
 
(B) Electron
 
(C) Neutron
 
(D) Atomic nucleus
 
23. Isotopes of an elements have –
 
(A) different chemical properties
 
(B) different atomic
 
(C) The same physical properties
 
(D) Different number of neutrons
 
24. Which one of the following is a correct electronic configuration of calcium–
 
(A) 2, 8, 8, 1
 
(B) 2, 6, 8, 2
 
(C) 2, 8, 8, 2
 
(D) 2, 8, 2, 8
 
25. Which one of the following is a correct electronic configuration of cromium–
 
(A) 2, 8, 8, 6
 
(B) 2, 8, 8, 2, 4
 
(C) 2, 8, 8, 1,5
 
(D) 2, 8, 8, 2, 5
 
JEE Chemistry Structure of Atoms MCQs A
28. The total number of neutrons in zinc (z = 30) with mass number 70 is -
 
(1) 40
 
(2) 20
 
(3) 36
 
(4) 38
 
29. The sum of number of neutron and protons in one of the isotopes of hydrogen is-
 
(1) 3
 
(2) 2
 
(3) 5
 
(4) 6
 
30. Deflection back of a few particles on hitting thin foil of gold shows that-
 
(1) Nucleus in heavy
 
(2) Nucleus in small
 
(3) Both (1) and (2)
 
(4) Electron create hinderance in the movement of -particles.
 
 
More Questions...........................................

 

Question: The mass of a photon with a wavelength equal to 1.54 × 10–8 cm is

  • a) 1.4285 × 10–32 kg
  • b) 0.8268 × 10–34 kg
  • c) None of these
  • d) 1.2876 × 10–33 kg

Answer: 1.4285 × 10–32 kg

 

Question: If the Planck’s constant h = 6.6×10–34 Js, the de Broglie wavelength of a particle having momentum of 3.3 × 10–24 kg ms –1 will be

  • a) 2Å
  • b) 0.002 Å
  • c) 0.5Å
  • d) 500Å

Answer: 

 

Question: The values of Planck's constant is 6.63 × 10–34 Js. The velocity of light is 3.0 × 108 m s–1. Which value is closest to the wavelength in nanometres of a quantum of light with frequency of 8 × 1015 s–1?

  • a) 4 × 101
  • b) 2 × 10–25
  • c) 5 × 10–18
  • d) 3 × 107

Answer: 4 × 101

 

Question: The de Broglie wavelength of a car of mass 1000 kg and velocity 36 km/hr is

  • a) 6.626 × 10–38 m
  • b) 6.626 × 10– 30 m
  • c) 6.626 × l0–34 m
  • d) 6.626 × 10–31 m

Answer: 6.626 × 10–38 m

 

Question: Heisenberg uncertainty principle can be explained as

  • a) 

  • b)

  • c)

  • d)

Answer:

 

Question: Heisenberg's uncertainity principle is applicable to

  • a) any moving object
  • b) electron only
  • c) atoms only
  • d) nucleus only

Answer: any moving object

 

Question: The position of both, an electron and a helium atom is known within 1.0 nm. Further the momentum of the electron is known within 5.0 × 10–26 kg ms–1. The minimum uncertainty in the measurement of the momentum of the helium atom is

  • a) 5.0 × 10–26 kg ms–1
  • b) 80 kg ms–1
  • c) 50 kg ms–1
  • d) 8.0 × 10–26 kg ms–1

Answer: 5.0 × 10–26 kg ms–1

 

Question: Uncertainty in the position of an electron (mass = 9.1 × 10–31 kg) moving with a velocity 300 ms–1, accurate upto 0.001% will be (h = 6.63 × 10–34 Js)

  • a) 1.92 × 10–2 m
  • b) 3.84 × 10–2 m
  • c) 5.76 × 10–2 m
  • d) 19.2 × 10–2 m

Answer: 1.92 × 10–2 m

 

Question: The uncertainty in the position of an electron (mass = 9.1 × 10–28 g) moving with a velocity of 3.0 × 104 cm s–1 accurate upto 0.011% will be

  • a) 0.175 cm
  • b) 1.92 cm
  • c) 7.68 cm
  • d) 3.84 cm

Answer: 0.175 cm

 

Question: The Heisenberg uncertainity principle will be most significant for which of the following object ?

  • a) Object B of mass 9.11 × 10–28 g
  • b) Object A of mass 9.11 × 10–30 kg
  • c) Object C of mass 9.11 × 10–24 mg
  • d) Object D of mass 9.11 × 10–28 kg

Answer:  Object B of mass 9.11 × 10–28 g

 

Question: The orientation of an atomic orbital is governed by

  • a) Magnetic quantum number
  • b) Principal quantum number
  • c) Azimuthal quantum number
  • d) Spin quantum number

Answer: Magnetic quantum number

 

Question:  For which one of the following sets of four quantum numbers, an electron will have the heighest energy?

  • a)

  • b)

  • c)

  • d) None of these

Answer:

 

Question: Which of the following sets of quantum numbers is correct for an electron in 4f orbital ?

  • a)

  • b)

  • c)

  • d)

Answer:

 

Question:

  • a)

  • b)

  • c)

  • d) None of these

Answer:

 

Question: Which of the following represents correct set of the four quantum numbers for an electron in a 4d subshell ?

  • a) 4, 2, 1, – 1/2
  • b) 4, 3, – 2, – 1/2
  • c) 4, 2, 1, 0
  • d) 4, 3, 2, + 1/2

Answer: 4, 2, 1, – 1/2

 

Question: The total number of electrons that can be accommodated in all orbitals having principal quantum number 2 and azimuthal quantum number 1 is

  • a) 6
  • b) 2
  • c) 4
  • d) 8

Answer: 6

 

Question:

  • a) 14
  • b) 6
  • c) 0
  • d) 2

Answer: 14

 

Question: Which of the following is not permissible arrangement of electrons in an atom?

  • a)

  • b)

  • c)

  • d)

Answer:

 

Question: Which of the following sets of quantum numbers represents the highest energy of an atom?

  • a)

  • b)

  • c)

  • d)

Answer:

 

Question: What will be the sum of all possible values of l and m for n = 5 ?

  • a) 13
  • b) 9
  • c) 12
  • d) 4

Answer: 13

 

Question: The following quantum numbers are possible for how many orbital(s) n = 3, l = 2, m = +2 ?

  • a) 1
  • b) 3
  • c) 4
  • d) 2

Answer: 1

 

Question: The orbitals are called degenerate when

  • a) they have the same energy
  • b) they have different wave functions but same energy
  • c) they have the same wave functions but different energies
  • d) they have the same wave functions

Answer: they have the same energy

 

Question:  The number of spherical nodes in 3p orbitals are

  • a) one
  • b) three
  • c) None of these
  • d) two

Answer: one

 

Question:  Which of the following graph correspond to one node

  • a)

  • b)

  • c)

  • d)

Answer:

 

Question: If there are five radial nodes, then what can be the correct representation of the orbital for n = 8.

  • a) 8d
  • b) 8p
  • c) 8s
  • d) 8f

Answer: 8d

 

Question: What can be the representation of the orbital having 3 angular nodes and n = 5.

  • a) 5f
  • b) 5s
  • c) 5d
  • d) 5p

Answer: 5f

 

Question: The number of orbitals present in the fifth shell will be

  • a) 25
  • b) 50
  • c) 10
  • d) 20

Answer: 25

 

Question:  Arrange the orbital of same shell in the increasing order of shielding strength of the outer shell of electrons. s, f, d, p

  • a) s > p > d > f
  • b) s > p < d < f
  • c) s < p < d < f
  • d) s > p > d < f

Answer: s > p > d > f

 

Question: Which of the following is not correct for electronic distribution in the ground state ?

  • a)  All of the above
  • b)

  • c)

  • d)

Answer: All of the above

 

Question: The electronic configuration of gadolinium (Atomic number 64) is

  • a)

  • b)

  • c)

  • d)

Answer:

  

Question: The order of filling of electrons in the orbitals of an atom will be

  • a) 4s, 3d, 4p, 5s, 4d
  • b) 3d, 4p, 4s, 4d, 5s
  • c) 3d, 4s, 4p, 4d, 5s
  • d) 5s, 4p, 3d, 4d, 5s

Answer: 4s, 3d, 4p, 5s, 4d

 

Question:

  • a) 6
  • b) 4
  • c) 5
  • d) 3

Answer: 6

 

Question:

  • a) ground state
  • b) anionic form
  • c) excited state
  • d) cationic form

Answer: ground state

 

Question: Number of unpaired electrons in N2+ is

  • a) 1
  • b) 2
  • c) 0
  • d) 3

Answer: 1

 

Question: An ion has 18 electrons in the outermost shell, it is

  • a)

  • b)

  • c)

  • d)

Answer:

 

Question: In a given atom no two electrons can have the same values for all the four quantum numbers. This is called

  • a) Pauli’s exclusion principle
  • b) Aufbau principle
  • c) Hund’s Rule
  • d) Uncertainty principle

Answer: Pauli’s exclusion principle

 

Question: The electronic configuration of Cu (atomic number 29) is

  • a)

  • b)

  • c)

  • d)

Answer:

 

Question: The orbital diagram in which the Aufbau principle is violated is

  • a)

  • b)

  • c)

  • d) None of these

Answer:

 

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