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Objective Questions

Latest CG SET Chemical Science Exam Question (Objective Questions), MCQ in English

Subjects : Chemical Science

Question Bank CG SET Chemical Science Exam - English
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Chemical Science

Question 1Single Answer
The modern periodic law is based primarily on?
  1. A
    mass number
  2. B
    neutron number
  3. C
    atomic mass
  4. D
    atomic number
Question 2Single Answer
Across a period, the effective nuclear charge generally?
  1. A
    increases
  2. B
    becomes zero
  3. C
    decreases
  4. D
    remains exactly constant
Question 3Single Answer
Across a period, atomic radius generally?
  1. A
    remains constant
  2. B
    increases
  3. C
    decreases
  4. D
    first becomes infinite
Question 4Single Answer
Down a group, atomic radius generally?
  1. A
    remains constant
  2. B
    increases
  3. C
    decreases
  4. D
    becomes zero
Question 5Single Answer
The first ionization enthalpy generally increases across a period because of?
  1. A
    increasing effective nuclear charge
  2. B
    increasing shielding by a new shell
  3. C
    complete absence of electron-electron repulsion
  4. D
    decreasing nuclear charge
Question 6Single Answer
The first ionization enthalpy generally decreases down a group mainly because of?
  1. A
    increased size and shielding
  2. B
    decreased number of shells
  3. C
    increased effective attraction without shielding
  4. D
    loss of all core electrons
Question 7Single Answer
Among alkali metals, the lowest first ionization enthalpy is expected toward the?
  1. A
    top of the group
  2. B
    bottom of the group
  3. C
    middle only
  4. D
    noble-gas end of the same period
Question 8Single Answer
A cation is usually smaller than its parent atom because?
  1. A
    electron gain increases shielding
  2. B
    neutrons expand the electron cloud
  3. C
    the nucleus loses protons
  4. D
    electron loss reduces repulsion and may remove the outer shell
Question 9Single Answer
An anion is usually larger than its parent atom because?
  1. A
    the principal quantum number always decreases
  2. B
    a proton is removed
  3. C
    the nuclear charge increases
  4. D
    added electron-electron repulsion expands the electron cloud
Question 10Single Answer
In an isoelectronic series, ionic radius decreases as?
  1. A
    nuclear charge increases
  2. B
    number of electrons increases
  3. C
    principal shell number increases
  4. D
    nuclear charge decreases
Question 11Single Answer
The most electronegative element on the Pauling scale is?
  1. A
    nitrogen
  2. B
    chlorine
  3. C
    fluorine
  4. D
    oxygen
Question 12Single Answer
Electronegativity generally decreases down a group because?
  1. A
    effective nuclear charge becomes infinite
  2. B
    nuclear charge decreases to zero
  3. C
    valence shells disappear
  4. D
    atomic size and shielding increase
Question 13Single Answer
Electron affinity is most directly associated with?
  1. A
    addition of an electron to a gaseous atom
  2. B
    addition of a neutron
  3. C
    removal of an electron from a solid
  4. D
    removal of a proton
Question 14Single Answer
The relatively low electron affinity of fluorine compared with chlorine is largely due to?
  1. A
    greater electron-electron repulsion in the compact 2p shell
  2. B
    filled d orbitals in fluorine
  3. C
    absence of nuclear charge in fluorine
  4. D
    larger size of fluorine
Question 15Single Answer
The exceptionally high ionization enthalpy of noble gases is related to?
  1. A
    absence of protons
  2. B
    single valence electrons
  3. C
    stable closed-shell configurations
  4. D
    very large atomic radii
Question 16Single Answer
The first ionization enthalpy of Be is higher than that of B mainly because Be has?
  1. A
    a filled 2p subshell
  2. B
    a filled 2s subshell
  3. C
    one fewer proton
  4. D
    a larger atomic radius
Question 17Single Answer
The first ionization enthalpy of N is higher than that of O mainly because N has?
  1. A
    a half-filled 2p subshell
  2. B
    a filled 2p subshell
  3. C
    a larger principal shell
  4. D
    no p electrons
Question 18Single Answer
Lanthanide contraction arises mainly from?
  1. A
    loss of all 5d electrons
  2. B
    poor shielding by 4f electrons
  3. C
    decreasing nuclear charge
  4. D
    excellent shielding by 4f electrons
Question 19Single Answer
Diagonal relationship is especially prominent between?
  1. A
    F and Cl
  2. B
    Be and Mg
  3. C
    Li and Mg
  4. D
    Li and Na
Question 20Single Answer
The inert-pair effect becomes more important down the p-block because?
  1. A
    the ns2 pair becomes less available for bonding
  2. B
    p orbitals vanish
  3. C
    electronegativity always increases
  4. D
    all valence electrons become unpaired
Question 21Single Answer
The metallic character generally increases?
  1. A
    down a group
  2. B
    with increasing ionization enthalpy
  3. C
    toward fluorine
  4. D
    across a period from left to right
Question 22Single Answer
The nonmetallic character generally increases?
  1. A
    across a period from left to right
  2. B
    with decreasing electronegativity
  3. C
    down alkali-metal group
  4. D
    with increasing atomic radius
Question 23Single Answer
A large jump between successive ionization enthalpies usually indicates?
  1. A
    electron affinity has become positive
  2. B
    the atom has become neutral again
  3. C
    nuclear charge has decreased
  4. D
    removal has begun from an inner closed shell
Question 24Single Answer
Slater's rules are used to estimate?
  1. A
    molecular symmetry only
  2. B
    nuclear spin
  3. C
    bond order directly
  4. D
    shielding and effective nuclear charge
Question 25Single Answer
The shielding ability of subshells of the same principal shell generally follows?
  1. A
    d > s > p > f
  2. B
    p > s > f > d
  3. C
    s > p > d > f
  4. D
    f > d > p > s
Question 26Single Answer
A physically acceptable wavefunction must be?
  1. A
    multivalued everywhere
  2. B
    single-valued, finite and continuous where the potential is finite
  3. C
    infinite at all boundaries
  4. D
    discontinuous at every point
Question 27Single Answer
The Born interpretation associates the square modulus of a wavefunction with?
  1. A
    nuclear charge
  2. B
    potential energy only
  3. C
    probability density
  4. D
    classical trajectory
Question 28Single Answer
An observable in quantum mechanics is represented by?
  1. A
    a Hermitian operator
  2. B
    a classical orbit
  3. C
    a non-Hermitian matrix only
  4. D
    an arbitrary complex number
Question 29Single Answer
Eigenvalues of a Hermitian operator are?
  1. A
    real
  2. B
    always negative
  3. C
    undefined
  4. D
    always imaginary
Question 30Single Answer
Two observables can have simultaneous exact eigenvalues when their operators?
  1. A
    are identical to zero
  2. B
    anticommute only
  3. C
    commute
  4. D
    are non-Hermitian
Question 31Single Answer
The commutator of position and its conjugate momentum is?
  1. A
    equal to the identity without an imaginary factor
  2. B
    undefined for all states
  3. C
    always zero
  4. D
    nonzero
Question 32Single Answer
The uncertainty principle reflects?
  1. A
    thermal expansion only
  2. B
    noncommutation of conjugate observables
  3. C
    classical friction
  4. D
    instrumental error only
Question 33Single Answer
The Hamiltonian operator represents?
  1. A
    linear momentum only
  2. B
    spin only
  3. C
    probability only
  4. D
    total energy
Question 34Single Answer
A stationary state is an eigenstate of?
  1. A
    the time-independent Hamiltonian
  2. B
    position only
  3. C
    parity only
  4. D
    temperature
Question 35Single Answer
Normalization of a wavefunction ensures that?
  1. A
    the wavefunction is real
  2. B
    total probability is unity
  3. C
    energy is zero
  4. D
    momentum is infinite
Question 36Single Answer
Orthogonal eigenfunctions have?
  1. A
    unit overlap always
  2. B
    infinite overlap
  3. C
    identical eigenvalues necessarily
  4. D
    zero overlap integral
Question 37Single Answer
For a particle in a one-dimensional box, the wavefunction at infinite walls is?
  1. A
    maximum
  2. B
    undefined
  3. C
    periodic with nonzero boundary value
  4. D
    zero
Question 38Single Answer
Energy levels of a particle in a box become more widely separated as?
  1. A
    particle mass becomes infinite only
  2. B
    the box becomes larger
  3. C
    the box becomes smaller
  4. D
    quantum number decreases to zero
Question 39Single Answer
A two-dimensional square box can exhibit?
  1. A
    continuous energies only
  2. B
    only one allowed state
  3. C
    no degeneracy under any condition
  4. D
    degeneracy from different quantum-number pairs
Question 40Single Answer
For a three-dimensional rectangular box, separability means the wavefunction can be written as?
  1. A
    a classical trajectory
  2. B
    a constant only
  3. C
    a sum of nuclear charges
  4. D
    a product of one-dimensional functions
Question 41Single Answer
The ground-state energy of a quantum harmonic oscillator is?
  1. A
    exactly zero
  2. B
    negative infinite
  3. C
    undefined
  4. D
    nonzero
Question 42Single Answer
The nonzero ground-state energy of a harmonic oscillator is called?
  1. A
    zero-point energy
  2. B
    activation energy
  3. C
    ionization energy
  4. D
    lattice energy
Question 43Single Answer
Adjacent harmonic-oscillator levels in the ideal model are?
  1. A
    degenerate with all other levels
  2. B
    equally spaced
  3. C
    randomly spaced
  4. D
    continuously distributed
Question 44Single Answer
The rigid-rotor model assumes?
  1. A
    fixed bond length
  2. B
    no angular momentum
  3. C
    zero moment of inertia
  4. D
    continuously changing bond length
Question 45Single Answer
Rotational energy levels of a rigid rotor depend on?
  1. A
    principal quantum number only
  2. B
    angular momentum quantum number
  3. C
    nuclear charge only
  4. D
    electron spin only
Question 46Single Answer
Hydrogenic orbitals are eigenfunctions of?
  1. A
    the hydrogen-atom Hamiltonian
  2. B
    a classical Kepler orbit
  3. C
    temperature operator
  4. D
    viscosity operator
Question 47Single Answer
The principal quantum number primarily determines?
  1. A
    nuclear spin
  2. B
    hydrogenic energy and shell
  3. C
    spin orientation only
  4. D
    orbital orientation only
Question 48Single Answer
The azimuthal quantum number is associated with?
  1. A
    nuclear mass
  2. B
    temperature
  3. C
    orbital angular momentum
  4. D
    electron charge
Question 49Single Answer
The magnetic quantum number specifies?
  1. A
    electron mass
  2. B
    orientation of orbital angular momentum
  3. C
    spin magnitude
  4. D
    radial node count only
Question 50Single Answer
Electron spin is?
  1. A
    a vibrational coordinate
  2. B
    literal classical spinning of a charged sphere
  3. C
    orbital motion only
  4. D
    an intrinsic angular momentum
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