TNPSC Chemistry - Atomic Structure
Exam Duration: 45 Mins Total Questions : 30
The absolute value of charge on electron was determined by
- (a)
JJ Thomson
- (b)
Rutherford
- (c)
Priestly
- (d)
RA Millikan
Match the Column I with Column II.
Column I | Column II |
A. Proton | 1. Rutherford |
B. Electron | 2. Chadwick |
C. Neutron | 3. Thomson |
D. Nucleus | 4. Goldstein |
- (a)
A B C D 4 3 2 1 - (b)
A B C D 3 2 1 4 - (c)
A B C D 2 1 4 3 - (d)
A B C D 1 4 3 2
Which of the following p[air(s) is /are correctly matched?
1. Isotopes Atoms with same atomic number but different atomic mass.
2. Isobars Atoms with same number of neutrons but different atomic number.
3. Isotones Atoms with same mass number but different atomic number.
Select the correct answer using the codes given below.
- (a)
1,2 and 3
- (b)
Only 1
- (c)
1 and 2
- (d)
Only 2
Two atoms are said to be isotopes if
- (a)
they have the same atomic number, but different mass number
- (b)
they have the same number of neutrons, but different mass number
- (c)
the sum of the number of protons and neutrons is the same but the number of protons is different
- (d)
they have the same number of neutrons, but different modes of radoactive decay
Which of the recent developments has proved the existence of atoms?
- (a)
Scanning tunneling microscopy
- (b)
X-ray diffraction
- (c)
Infrared spetroscopy
- (d)
Mass spectroscopy
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
Match the rule given in Column I with the statement given in Column II
Column I | Column II |
A. Pauli's exclusion principal | 1. In orbitals of equivalent energy electron spins remain unpaired if possible. |
B. Hund's rule | 2. Transition from the higher shell to K-shell. |
C. Lyman series | 3. The effect of magnetic field on the atomic spectrons. |
D. Zeeman effect | 4. No two electrons may all the four quantum number identical. |
- (a)
A B C D 1 2 3 4 - (b)
A B C D 4 1 2 3 - (c)
A B C D 2 3 4 1 - (d)
A B C D 3 4 1 2
Consider the following pairs of ions or atoms
1. Na+ and Ne
2. Na+ and K+
3. K+ and CI-
In Which of these pair are the ions/atoms isoelectronic with each other?
- (a)
1,2 and 3
- (b)
1 and 2
- (c)
2 and 3
- (d)
1 and 3
The nucleus of a singly ionized carbon atom contais
- (a)
6 protons and 6 neutrons
- (b)
5 protons and 6 neutrons
- (c)
6 protons, 6 neutrons and 6 electrons
- (d)
12 protons, 6 neutrons and 6 electrons
The constituent particles of a nucleus in an atom are
- (a)
electron and proton
- (b)
proton and neutron
- (c)
electron and neutron
- (d)
electron,proton and neutron
Regarding the atom of a chemical element, the magnetic quantum number refers to
- (a)
orientation
- (b)
shape
- (c)
size
- (d)
spin
Match the Column I (Discovery) with Column II (Scientist) and select the correct answer using the codes given below thw columns.
Column I (Discovery) |
Column II (Scientist) |
A. Radioactivity | 1. Moseley |
B. Quantum theory | 2. Planck |
C. Theory of photoelectric effect | 3. Becquerel |
D. Atomic number | 4. Einstein |
5. Rutherford |
- (a)
A B C D 3 2 4 1 - (b)
A B C D 4 5 3 2 - (c)
A B C D 3 5 4 2 - (d)
A B C D 4 2 3 1
Consider the following statements
1. An atom consists of a positively charged sphere and the electrons are embedded in it.
2. The negative and positive charges are equal in magnitude. So, the atom as a whole in electrically neutral.
Which of the statements given above is/are correct about Thomson's model of an atom?
- (a)
Only 1
- (b)
Only 2
- (c)
1 and 2 both
- (d)
None of these
Rutherford's model of atom is considered unsuitable because
- (a)
a positively charged nucleus remain separated from negatively charged electrons
- (b)
an accelerated electron would continuously lose energy in the form of radiation
- (c)
nuclear mass is not sufficiently heavy to keep the light electron in its orbit
- (d)
the center of gravity of the system would be with in the volume of the nucleus
Consider the following statements
1. JJ Thomson was the first one to propose a model for the structure of an atom.
2. Rutheford designed an experiment for the arrangement of electrons with in an atom. In this experiment, fast moving alpha particles were made to fall on a thin gold foil.
Which of the statement(s) given above is/are correct?
- (a)
Only 1
- (b)
Only 2
- (c)
1 and 2
- (d)
None of these
Which one among the following statements about an atom is not correct?
- (a)
Atoms always combine to form molecule
- (b)
Atoms are the basic units from which molecules and ions are formed
- (c)
Atoms are always neutral in nature
- (d)
Atoms aggregate in large number to form the matter we can see, feel and touch
Consider the following statements
1. An electronic emission spectrum will contain more lines than the corresponding absorptions.
2. In any p-orbital there are maximum of six electrons.
3. absolute value of the charge of the electron was determined by Millikan.
4. Electron in the H-atom in its ground state can absorb energy but can't emit energy.
Which of the above is/are true?
- (a)
Only 1
- (b)
2 and 3
- (c)
1,3 and 4
- (d)
All of the above
Which of the following statements does not form a part of Bohr's model hydrogen atom?
- (a)
Energy of the electrons in the orbit is quantised
- (b)
The electron in the orbit nearest the nucleus has the lowest energy
- (c)
Electrons revolve in different orbits around the nucleus
- (d)
The position and velocity of the electrons in the orbital cannot be determined simultaneously
In an X-ray tube, a potential difference of several thousand volts accelerates electrons which then hit the target and X-rays are emitted. Why are the X-rays emitted?
- (a)
Because of electron transition in an atom
- (b)
Because of removal of an electron from an atom
- (c)
Because electron get decelerated
- (d)
Because of the heat prodacuced in the collision
In which one of the following is the valence electronic configuration, ns2 np3 found?
- (a)
Carbon
- (b)
Oxygen
- (c)
Nitrogen
- (d)
Argon
Propagation of light quanta may be described by
- (a)
photons
- (b)
protons
- (c)
neutrons
- (d)
electrons
p-orbitals in a given shell can accommodate up to
- (a)
four electrons
- (b)
two electrons with parallel spin
- (c)
six electrons
- (d)
two electrons with opposite spins
Match the principle in Column I with discoverer in Column II.
Column I (Principle) |
Column II (Discoverer) |
A. Exclusion principal | 1. Hund |
B. Multiplicity rule | 2. Heisenberg |
C. Uncertainty principle | 3. Planck |
D. Quantum theory | 4. Pauli |
Select the correct answer using the codes given below the columns.
- (a)
A B C D 2 3 4 1 - (b)
A B C D 3 4 1 2 - (c)
A B C D 4 1 2 3 - (d)
A B C D 1 2 4 3
Which one of the following is the electronic configuration of the bivalent calcium Ca2+ ?
- (a)
[Ne]3s2 3p6
- (b)
[Ne]3s2 3p4
- (c)
[Ar]4s2
- (d)
[Ar]3s2 3p6
Which involves the emission of least energy in the hydrogen atom?
- (a)
An electron moving from n=4 to n=2
- (b)
An electron moving from n=3 to n=2
- (c)
An electron moving from n=4 to n=1
- (d)
An electron moving from n=5 to n=2
Which one among the following is the most appropriate statement with respect to the atomic weight of an element?
- (a)
The atomic weight of an element is the sum total of the number of protons and neutrons present in the atom of an element
- (b)
Unlike mass number, the atomic weight of an element can be a fraction
- (c)
The atomic weight of an element is a whole number
- (d)
The atomic weight of all the atoms in an element is the same
Consider the following statements
1. JJ Thomson proposed that electrons are embedded in a positive sphere.
2. Rutherford's model of the atom proposed that a very tiny nucleus is present inside the atom and electrons revolve around this nucleus.
3. Neils Bohr's model proposed that electrons are distributed in different shells with discrete energy around the nucleus. If the atomic shells are complete, then the atom will be stable and less reactive.
Which of the statements given above are correct?
- (a)
1 and 2
- (b)
2 and 3
- (c)
1 and 3
- (d)
1,2 and 3
Neutron is a fundamental particle carrying
- (a)
a charge of +1 and mass of 1 unit
- (b)
no charge and o mass
- (c)
no charge and a mass of 1 unit
- (d)
a charge of -1 and a mass of 1 unit
The triad of nuclei which is isotonic is
- (a)
6C14 , 7N15 , 9F17
- (b)
6 C 12 , 7 N 14 , 9F19
- (c)
6 C 14 , 7 N 14 , 9F17
- (d)
6 C 14 , 7 N 14 , 9F19
Consider the following statements
1. Clusters of atoms that act as an ion are called polyatomic ions.
2. In ionic compounds, the charge on each ion is used to determined the chemical formula of the compound.
Which of the statement(s) given above is/are correct?
- (a)
Only 1
- (b)
Only 2
- (c)
1 and 2
- (d)
None of the above