Class 11 Chemistry - Structure of Atom - MERIT YARD
Class 11 Chem - Structure of Atom - MERIT YARD
1 / 40The fundamental subatomic particle with a negative electrical charge is the:
A) Electron
B) Proton
C) Neutron
D) Positron
2 / 40Who is scientifically credited with the discovery of the electron?
A) Ernest Rutherford
B) J.J. Thomson
C) James Chadwick
D) Niels Bohr
3 / 40Who is scientifically credited with the discovery of the neutron?
A) J.J. Thomson
B) Eugen Goldstein
C) James Chadwick
D) Ernest Rutherford
4 / 40The central nucleus of an atom strictly consists of:
A) Electrons and protons
B) Electrons and neutrons
C) Only protons
D) Protons and neutrons
5 / 40The atomic number \( (Z) \) of an element is exactly equal to the number of:
A) Protons
B) Neutrons
C) Nucleons
D) Total Atoms
6 / 40The mass number \( (A) \) of an atom is the total sum of the number of protons and:
A) Electrons
B) Neutrons
C) Positrons
D) Photons
7 / 40Atoms of the exact same element having different mass numbers are called:
A) Isobars
B) Isotones
C) Isotopes
D) Isomers
8 / 40Which of the following is the well-known radioactive isotope of Hydrogen?
A) Protium
B) Deuterium
C) Hydronium
D) Tritium
9 / 40The approximate speed of light \( (c) \) in a vacuum is:
A) \( 3 \times 10^8 \text{ m/s} \)
B) \( 3 \times 10^5 \text{ m/s} \)
C) \( 3 \times 10^{10} \text{ m/s} \)
D) \( 3 \times 10^6 \text{ m/s} \)
10 / 40The mathematical relationship between frequency \( (\nu) \), wavelength \( (\lambda) \), and speed of light \( (c) \) is:
A) \( c = \nu / \lambda \)
B) \( c = \nu \lambda \)
C) \( \lambda = c \nu \)
D) \( \nu = c \lambda \)
11 / 40The energy \( (E) \) of a single quantum of radiation is properly given by the formula:
A) \( E = mc^2 \)
B) \( E = \frac{h}{\lambda} \)
C) \( E = h\nu \)
D) \( E = \frac{1}{2}mv^2 \)
12 / 40What is the approximate scientific value of Planck's constant \( (h) \)?
A) \( 6.626 \times 10^{-23} \text{ J s} \)
B) \( 6.626 \times 10^{-19} \text{ J s} \)
C) \( 6.626 \times 10^{34} \text{ J s} \)
D) \( 6.626 \times 10^{-34} \text{ J s} \)
13 / 40The phenomenon of ejection of electrons from a metal surface when specific light strikes it is called:
A) Photoelectric effect
B) Compton effect
C) Zeeman effect
D) Stark effect
14 / 40The absolute minimum energy required to eject an electron from a metal surface is called the:
A) Kinetic energy
B) Work function
C) Potential energy
D) Thermal energy
15 / 40Bohr's classical model of the atom is strictly and successfully applicable only to:
A) Multi-electron atoms
B) Heavy metals
C) Single-electron species like \( H \)
D) Complex molecules
16 / 40According to Bohr's theory, the angular momentum of an electron is an integral multiple of:
A) \( \frac{h}{\pi} \)
B) \( h \)
C) \( 2\pi h \)
D) \( \frac{h}{2\pi} \)
17 / 40The de Broglie wavelength \( (\lambda) \) of a moving microscopic particle is given by:
A) \( \lambda = \frac{h}{p} \)
B) \( \lambda = hp \)
C) \( \lambda = \frac{p}{h} \)
D) \( \lambda = \frac{h}{mc^2} \)
18 / 40Heisenberg's Uncertainty Principle states we cannot simultaneously and precisely measure an electron's position and:
A) Mass
B) Momentum
C) Charge
D) Spin
19 / 40The principal quantum number \( (n) \) primarily determines the:
A) Shape of the orbital
B) Spin of the electron
C) Main energy level or shell
D) Magnetic orientation
20 / 40The azimuthal quantum number \( (l) \) primarily determines the:
A) Size of the shell
B) Spin of the electron
C) Orientation in space
D) Shape of the subshell
21 / 40For the \( s \)-subshell, the exact numerical value of the azimuthal quantum number \( (l) \) is:
A) \( 0 \)
B) \( 1 \)
C) \( 2 \)
D) \( 3 \)
22 / 40For the \( p \)-subshell, the exact numerical value of the azimuthal quantum number \( (l) \) is:
A) \( 0 \)
B) \( 1 \)
C) \( 2 \)
D) \( 3 \)
23 / 40The geometrical shape of an \( s \)-orbital is generally:
A) Dumb-bell
B) Double dumb-bell
C) Spherical
D) Extremely Complex
24 / 40The geometrical shape of a \( p \)-orbital is generally:
A) Spherical
B) Circular
C) Double dumb-bell
D) Dumb-bell
25 / 40What is the absolute maximum number of electrons any single \( s \)-orbital can hold?
A) \( 2 \)
B) \( 6 \)
C) \( 10 \)
D) \( 14 \)
26 / 40What is the maximum total number of electrons an entire \( p \)-subshell can accommodate?
A) \( 2 \)
B) \( 6 \)
C) \( 10 \)
D) \( 14 \)
27 / 40What is the maximum total number of electrons an entire \( d \)-subshell can accommodate?
A) \( 2 \)
B) \( 6 \)
C) \( 10 \)
D) \( 14 \)
28 / 40Two electrons occupying the exact same orbital must strictly have:
A) Parallel spins
B) Same quantum numbers
C) Zero spin
D) Opposite spins
29 / 40"No two electrons in an atom can have the same set of all four quantum numbers." This describes:
A) Pauli's exclusion principle
B) Hund's rule
C) Aufbau principle
D) Bohr's postulate
30 / 40"Electrons fill atomic orbitals of the lowest available energy levels before occupying higher levels." This is the:
A) Hund's rule
B) Aufbau principle
C) Pauli's exclusion principle
D) Heisenberg principle
31 / 40According to Hund's rule, electron pairing in orbitals of the same subshell does not start until:
A) The shell is full
B) The atom is ionized
C) Each orbital is singly occupied
D) The temperature increases
32 / 40The total maximum number of electrons allowed in any main principal shell \( n \) is mathematically given by:
A) \( n^2 \)
B) \( 2n \)
C) \( 2n + 1 \)
D) \( 2n^2 \)
33 / 40The magnetic quantum number \( (m_l) \) specifies the exact:
A) Spatial orientation of the orbital
B) Shape of the orbital
C) Size of the orbital
D) Spin of the electron
34 / 40The correct and complete ground state electronic configuration of Sodium (Na, \( Z=11 \)) is:
A) \( 1s^2 2s^2 2p^6 3s^2 \)
B) \( 1s^2 2s^2 2p^6 3s^1 \)
C) \( 1s^2 2s^2 2p^5 3s^2 \)
D) \( 1s^2 2s^2 2p^6 3p^1 \)
35 / 40The correct and complete ground state electronic configuration of Carbon (C, \( Z=6 \)) is:
A) \( 1s^2 2s^2 2p^4 \)
B) \( 1s^2 2s^2 2p^1 \)
C) \( 1s^2 2s^2 2p^2 \)
D) \( 1s^2 2s^1 2p^3 \)
36 / 40The splitting of spectral lines under the influence of an external magnetic field is known as the:
A) Stark effect
B) Compton effect
C) Photoelectric effect
D) Zeeman effect
37 / 40The splitting of spectral lines under the influence of an external electric field is known as the:
A) Stark effect
B) Zeeman effect
C) Bohr effect
D) Thomson effect
38 / 40Isotones are atoms of different elements that have the exact same number of:
A) Protons
B) Neutrons
C) Electrons
D) Nucleons
39 / 40How many exact \( d \)-orbitals exist in a single complete \( d \)-subshell?
A) \( 1 \)
B) \( 3 \)
C) \( 5 \)
D) \( 7 \)
40 / 40Isobars are atoms of different elements that have the exact same:
A) Atomic number
B) Number of neutrons
C) Number of electrons
D) Mass number
Test Analysis

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Unattempted ⚠️ 40

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