In an atom the order of filling up of the orbitals is governed by

Heisenberg's uncertainly principle

Bohr model can explain about

Spectrum of one atom/ion having one electron only

The number of protons in a negatively charged atom (anion) is

more than the atomic number of the element

less than the atomic number of the element

more than the number of elecrons in the atom

less than the number of electrons in the atom

The nucleus of a singly ionized carbon atom contains

6 protons and 6 neutrons and 6 electrons

12 protons and 6 neutrons and 6 electrons

Protons and neutrons are bound in a nucleus by the

long range 'electromagnetic interaction'

short range 'strong interaction'

long range 'electromagnetic interaction'

long range 'gravitational interaction'

The atomic orbital is

the circular path of the electron

three dimensional field around nucleus

the region in which there is maximum probability of finding electron

protons, neutrons and electrons

In 35CI34 and 37CI17 which of the following is false ?

Both show same chemical properties

155 + Mcqs in Atomic Structure in Chemistry Page 1 McqOptions

1.	Which one is not the isotopes of hydrogen ?
A.	Protium
B.	Eritium
C.	Deuterium
D.	Tritium
Answer» C. Deuterium

Discussion

2.	Rutherford's scattering experiment related to the size of the
A.	nucleus
B.	atom
C.	electron
D.	neutron
Answer» B. atom

Discussion

3.	Isotopes of the same elements have
A.	same number of neutrons
B.	same number of protons
C.	same atomic mass
D.	different chemical properties
Answer» C. same atomic mass

Discussion

4.	Radioactive isotope of hydrogen is
A.	Protium
B.	Deuterium
C.	Tritium
D.	All
Answer» D. All

Discussion

5.	In an atom the order of filling up of the orbitals is governed by
A.	Aufbau principle
B.	Heisenberg's uncertainly principle
C.	Hund's rule
D.	Pauli's exclusion principle
Answer» B. Heisenberg's uncertainly principle

Discussion

6.	Regarding the atom of a chemical element, magnetic quantum number refers to
A.	orientation
B.	shape
C.	size
D.	spin
Answer» B. shape

Discussion

7.	Bohr model can explain about
A.	Spectrum of Hydrogen atoms
B.	Spectrum of one atom/ion having one electron only
C.	Spectrum of Hydrogen molecule
D.	None of these
Answer» C. Spectrum of Hydrogen molecule

Discussion

8.	Consider the following pairs of ions or atoms 1. Na⁺ and NC 2. Na⁺ and K⁺ 3. K⁺ and CI^- In which of these pair are the ions/atoms iso - electronic with each other ?
A.	1, 2 and 3
B.	1 and 2
C.	2 and 3
D.	1 and 3
Answer» E.

Discussion

9.	Which of the following electromagnetic wave has the longest wavelength ?
A.	Infra red rays
B.	Gamma rays
C.	Light rays
D.	Ultra-violet rays
Answer» B. Gamma rays

Discussion

10.	In isotopes the number of neutrons are
A.	same
B.	different
C.	both
D.	None of these
Answer» C. both

Discussion

11.	Species containing same number of electrons are called
A.	isotopes
B.	isobars
C.	isoelectronic
D.	isotones
Answer» D. isotones

Discussion

12.	Gamma rays are
A.	high energy electrons
B.	low energy electrons
C.	high energy electromagnetic
D.	high energy positrons waves
Answer» D. high energy positrons waves

Discussion

13.	Which one of the among the following is used as a moderator in nuclear reactors?
A.	Ozone
B.	Heavy hydrogen
C.	Heavy water
D.	Hydrogen peroxide
Answer» D. Hydrogen peroxide

Discussion

14.	In which one of the following is the valence electronic configuration, ns²np³found ?
A.	Carbon
B.	Oxygen
C.	Nitrogen
D.	Argon
Answer» D. Argon

Discussion

15.	An ideal gas is one which obeys
A.	Gas laws
B.	Boyle's laws
C.	Charle's law
D.	Avogadro's law
Answer» B. Boyle's laws

Discussion

16.	Cinnabar is an ore of
A.	Hg
B.	Cu
C.	Pb
D.	Zn
Answer» B. Cu

Discussion

17.	The number of protons in a negatively charged atom (anion) is
A.	more than the atomic number of the element
B.	less than the atomic number of the element
C.	more than the number of elecrons in the atom
D.	less than the number of electrons in the atom
Answer» E.

Discussion

18.	The nucleus of a singly ionized carbon atom contains
A.	6 protons and 6 neutrons
B.	5 protons and 6 neutrons
C.	6 protons and 6 neutrons and 6 electrons
D.	12 protons and 6 neutrons and 6 electrons
Answer» B. 5 protons and 6 neutrons

Discussion

19.	Structure of solids investigated by using
A.	cosmic rays
B.	Z - rays
C.	infrared
D.	y - rays
Answer» C. infrared

Discussion

20.	The nitrogen atom has 7 protons and 7 electrons. The nitride ion will have
A.	10 protons and 7 electrons
B.	7 protons and 10 electrons
C.	4 protons and 7 electrons
D.	4 protons and 10 electrons
Answer» C. 4 protons and 7 electrons

Discussion

21.	An atom has 7 electrons in its M - shell and contains 18 neutrons in its nucleus. What is its mass number ?
A.	25
B.	27
C.	35
D.	43
Answer» D. 43

Discussion

22.	Cathode rays are deflected towards
A.	(a) & (b) alternatively
B.	None of the above
Answer» B. None of the above

Discussion

23.	Which of the following has highest frequency ?
A.	Cosmic rays
B.	X - rays
C.	Radio waves
D.	Micro waves
Answer» B. X - rays

Discussion

24.	Which of the following has highest frequency?
A.	Cosmic rays
B.	X-rays
C.	Radio waves
D.	Micro wavews
Answer» B. X-rays

Discussion

25.	Which of the following electromagnetic wave has the longest wave length ?
A.	Infra red rays
B.	Gamma rays
C.	Light rays
D.	Ultra - violet rays
Answer» B. Gamma rays

Discussion

26.	Consider the following statements: 1. Maximum covalency of carbon is 4, whereas maximum covalency of silicon is 6. 2. The maximum covalency of an element is limited to 6. Which of the statements given above is /are correct ?
A.	1 only
B.	2 only
C.	Both 1 and 2
D.	Neither 1 nor 2
Answer» B. 2 only

Discussion

27.	Which one among the following is the equivalent weight of sulphuric acid? (Atomic weight : H = 1, S = 32, O = 16)
A.	98
B.	60
C.	100
D.	49
Answer» E.

Discussion

28.	Positive ions are formed from neutral atoms by loss of
A.	neutrons
B.	protons
C.	nuclear charge
D.	electrons
Answer» E.

Discussion

29.	Neutron was discovered by
A.	J.J. Thomson
B.	Chadwick
C.	Rutherford
D.	Priestley
Answer» C. Rutherford

Discussion

30.	Nuclear particles responsible for holding all nucleons together are
A.	electrons
B.	neutrons
C.	positrons
D.	mesons
Answer» E.

Discussion

31.	Protons and neutrons are bound in a nucleus by the
A.	short range 'weak interaction'
B.	short range 'strong interaction'
C.	long range 'electromagnetic interaction'
D.	long range 'gravitational interaction'
Answer» C. long range 'electromagnetic interaction'

Discussion

32.	Discovery of the nucleus of an atom was due to the experiment carried out by
A.	Bohr
B.	Rutherford
C.	Moseley
D.	Thomson
Answer» C. Moseley

Discussion

33.	The atomic orbital is
A.	the circular path of the electron
B.	elliptical shaped orbit
C.	three dimensional field around nucleus
D.	the region in which there is maximum probability of finding electron
Answer» E.

Discussion

34.	Meson was discovered by
A.	Powell
B.	Seaburg
C.	Anderson
D.	Yukawa
Answer» E.

Discussion

35.	The nuclear fuel in the sun is
A.	helium
B.	hydrogen
C.	uranium
D.	alpha particles
Answer» B. hydrogen

Discussion

36.	The atoms of the elements having same mass number but different atomic number are called
A.	isotopes
B.	isobars
C.	isotones
D.	isomers
Answer» C. isotones

Discussion

37.	Any P-orbital can accommodate up to
A.	4-electrons
B.	6-electrons
C.	2-electrons in opposite
D.	None of these
Answer» C. 2-electrons in opposite

Discussion

38.	Wavelength of which of the following colors of the visible spectrum of light are maximally absorbed by green plants
A.	green and yellow
B.	red and blue
C.	green and red
D.	blue and yellow
Answer» C. green and red

Discussion

39.	Nucleons are
A.	protons and neutrons
B.	neutrons and electrons
C.	protons and electrons
D.	protons, neutrons and electrons
Answer» B. neutrons and electrons

Discussion

40.	Which of the following is not electromagnetic in nature
A.	Cathode rays
B.	x - rays
C.	y - rays
D.	Infrared - rays
Answer» B. x - rays

Discussion

41.	Cathode rays are
A.	electromagnetic wave
B.	stream of - particle
C.	stream of electrons
D.	radiations
Answer» D. radiations

Discussion

42.	The number of unpaired electrons in carbon atom is
A.	2
B.	4
C.	1
D.	3
Answer» B. 4

Discussion

43.	When spectral lines obtained from atomic spectra is placed in a magnetic field they are splitted into number of fine lines, this is called ..........
A.	Stark's effect
B.	Photoelectric effect
C.	Zeeman's effect
D.	None of these
Answer» D. None of these

Discussion

44.	The constituent particle of a nucleus in an atom are
A.	electron and proton
B.	proton and neutron
C.	electron and neutron
D.	electron, proton and neutron
Answer» C. electron and neutron

Discussion

45.	The isotone of ⁷⁶Ge₃₂ is
A.	Ge
B.	As
C.	Se
D.	Se
Answer» E.

Discussion

46.	³⁵CI₁₇ and ³⁷CI₁₇ are called
A.	Isotopes
B.	Isomers
C.	Isotones
D.	None
Answer» B. Isomers

Discussion

47.	In ³⁵CI₃₄ and ³⁷CI₁₇ which of the following is false ?
A.	Both have 17 protons
B.	Both have 17 electrons
C.	Both have 18 neutrons
D.	Both show same chemical properties
Answer» D. Both show same chemical properties

Discussion

48.	Whose experiment proved that the speed of light was always the same
A.	James clark maxwell
B.	Michelson and Morley
C.	Miller and Stanley
D.	Werner Heisenberg
Answer» C. Miller and Stanley

Discussion

49.	Discovery of the nucleus of an atom was due to the experiment carried out by
A.	Bohr
B.	Rutherford
C.	Moseley
D.	Thomson
Answer» C. Moseley

Discussion

50.	CN^- ion is isoelectronic with
A.	N
B.	CO
C.	both a & b
D.	none
Answer» D. none

Discussion

Explore topic-wise MCQs in Chemistry.

Which one is not the isotopes of hydrogen ?

Rutherford's scattering experiment related to the size of the

Isotopes of the same elements have

Radioactive isotope of hydrogen is

In an atom the order of filling up of the orbitals is governed by

Regarding the atom of a chemical element, magnetic quantum number refers to

Bohr model can explain about

Consider the following pairs of ions or atoms1. Na+ and NC2. Na+ and K+3. K+ and CI-In which of these pair are the ions/atoms iso - electronic with each other ?

Which of the following electromagnetic wave has the longest wavelength ?

In isotopes the number of neutrons are

Species containing same number of electrons are called

Gamma rays are

Which one of the among the following is used as a moderator in nuclear reactors?

In which one of the following is the valence electronic configuration, ns2np3found ?

An ideal gas is one which obeys

Cinnabar is an ore of

The number of protons in a negatively charged atom (anion) is

The nucleus of a singly ionized carbon atom contains

Structure of solids investigated by using

The nitrogen atom has 7 protons and 7 electrons. The nitride ion will have

An atom has 7 electrons in its M - shell and contains 18 neutrons in its nucleus. What is its mass number ?

Cathode rays are deflected towards

Which of the following has highest frequency ?

Which of the following has highest frequency?

Which of the following electromagnetic wave has the longest wave length ?

Consider the following statements:1. Maximum covalency of carbon is 4, whereas maximum covalency of silicon is 6.2. The maximum covalency of an element is limited to 6.Which of the statements given above is /are correct ?

Which one among the following is the equivalent weight of sulphuric acid?(Atomic weight : H = 1, S = 32, O = 16)

Positive ions are formed from neutral atoms by loss of

Neutron was discovered by

Nuclear particles responsible for holding all nucleons together are

Protons and neutrons are bound in a nucleus by the

Discovery of the nucleus of an atom was due to the experiment carried out by

The atomic orbital is

Meson was discovered by

The nuclear fuel in the sun is

The atoms of the elements having same mass number but different atomic number are called

Any P-orbital can accommodate up to

Wavelength of which of the following colors of the visible spectrum of light are maximally absorbed by green plants

Nucleons are

Which of the following is not electromagnetic in nature

Cathode rays are

The number of unpaired electrons in carbon atom is

When spectral lines obtained from atomic spectra is placed in a magnetic field they are splitted into number of fine lines, this is called ..........

The constituent particle of a nucleus in an atom are

The isotone of 76Ge32 is

35CI17 and 37CI17 are called

In 35CI34 and 37CI17 which of the following is false ?

Whose experiment proved that the speed of light was always the same

Discovery of the nucleus of an atom was due to the experiment carried out by

CN- ion is isoelectronic with

Consider the following pairs of ions or atoms
1. Na⁺ and NC
2. Na⁺ and K⁺
3. K⁺ and CI^-
In which of these pair are the ions/atoms iso - electronic with each other ?

In which one of the following is the valence electronic configuration, ns²np³found ?

Consider the following statements:
1. Maximum covalency of carbon is 4, whereas maximum covalency of silicon is 6.
2. The maximum covalency of an element is limited to 6.
Which of the statements given above is /are correct ?

Which one among the following is the equivalent weight of sulphuric acid?
(Atomic weight : H = 1, S = 32, O = 16)

The isotone of ⁷⁶Ge₃₂ is

³⁵CI₁₇ and ³⁷CI₁₇ are called

In ³⁵CI₃₄ and ³⁷CI₁₇ which of the following is false ?

CN^- ion is isoelectronic with