JEE Questions for Chemistry Structure Of Atom Quiz 9 - MCQExams.com

Transition of an electron from n = 3 to n = 1 level results in
  • emission spectrum
  • band spectrum
  • infrared spectrum
  • X–ray spectrum
When alpha particles are sent through a thin metal foil, most of them go straight through the foil because
  • alpha particles are much heavier than electron
  • alpha particles are positively charged
  • alpha particles move with high velocity
  • most part of the atom is empty
The increasing order for the values of e/m (charge/mass) is
  • e, p, n, α
  • n, p, e, α
  • n, p, α, e
  • n, α, p, e
The number of unpaired electrons in a chromic ion, Cr3+ (atomic numberis
  • 6
  • 4
  • 3
  • 1
Which one of the following is the smallest in size?
  • N3−
  • O2−
  • F
  • Na+
A p – orbital can accommodate
  • 4 electrons
  • 6 electrons
  • 2 electrons with parallel spins
  • 2 electrons with opposite spins
The order of filling of electrons in the orbitals of an atom will be
  • 3d, 4s, 4p, 4d, 5s
  • 4s, 3d, 4p, 5s, 4d
  • 5s, 4p, 3d, 4d, 5s
  • 3d, 4p, 4s, 4d, 5s
Which of the following relates to photons both as wave motion and as a stream of particles?
  • Interference
  • E = mc2
  • Diffraction
  • E = hv
Which of the following represents the correct set of quantum numbers of a 4d electron?
  • 4, 3, 2, +1/2
  • 4, 2, 1, 0
  • 4, 3, -2, +1/2
  • 4, 2, 1, -1/2
The energy of an electron in the nth Bohr orbit of hydrogen atom is
  • 13.6/n4 eV
  • 13.6/n3 eV
  • –13.6/n2 eV
  • 13.6/n eV
Pick out the isoelectronic structures from the following:
Chemistry-Structure of Atom-7919.png
  • I and II
  • III and IV
  • I and III
  • II, III and IV
Which of the following is violation of Pauli’s exclusion principle?

  • Chemistry-Structure of Atom-7921.png
  • 2)
    Chemistry-Structure of Atom-7922.png

  • Chemistry-Structure of Atom-7923.png

  • Chemistry-Structure of Atom-7924.png
In which one of the following pairs of experimental observation and phenomenon, does the experimental observation correctly account for the phenomenon?
Chemistry-Structure of Atom-7925.png
  • only a
  • b
  • c
  • d
For which one of the following sets of four quantum numbers, an electron will have the highest energy?

  • Chemistry-Structure of Atom-7926.png
  • 2)
    Chemistry-Structure of Atom-7927.png

  • Chemistry-Structure of Atom-7928.png

  • Chemistry-Structure of Atom-7929.png
When an electron of charge e and mass m moves with a velocity v about the nuclear charge Ze in a circular orbit of radius r, the potential energy of the electron is given by
  • Ze2/r
  • - Ze2/r
  • Ze2/r
  • mv2/r.
Atomic weight of an element is not necessarily whole number because
  • it contains electrons, protons and neutrons
  • it contains allotropic forms
  • atoms are no longer considered indivisible
  • it contains isotopes
The orbital angular momentum of an electron in 2s orbital is

  • Chemistry-Structure of Atom-7931.png
  • zero

  • Chemistry-Structure of Atom-7932.png

  • Chemistry-Structure of Atom-7933.png
Which of the following has maximum number of unpaired electrons?
  • Mg2+
  • Ti3+
  • V3+
  • Fe2+
The energy of an electron in the first Bohr orbit of H atom is – 13.6 eV. The possible energy value (s) of the excited state (s) for electrons in Bohr orbits of hydrogen is (are)
  • –3.4 eV
  • –4.2 eV
  • –6.8 eV
  • + 6.8 eV
Which of the following is the main cause of late discovery of neutron?
  • Neutron is chargeless particle
  • Neutron is highly unstable particle
  • Neutron in the nucleus moves very fast
  • All of these
Planck’s constant has the same dimensions as that of
  • Power
  • Work
  • radiant energy
  • angular momentum
The electrons, identified by quantum numbers n and l, (i) n = 4, l = 1 (ii) n = 4, l = 0 (iii) n = 3, l = 2 (iv) n = 3, l = 1 can be placed in order of increasing energy, from the lowest to highest, as
  • (iv) < (ii) < (iii) < (i)
  • (ii) < (iv) < (i) < (iii)
  • (i) < (iii) < (ii) < (iv)
  • (iii) < (i) < (iv) < (ii)
Which of the following configurations is correct for iron?

  • Chemistry-Structure of Atom-7937.png
  • 2)
    Chemistry-Structure of Atom-7938.png

  • Chemistry-Structure of Atom-7939.png

  • Chemistry-Structure of Atom-7940.png
Principal, azimuthal and magnetic quantum numbers are respectively related to
  • size, orientation and shape
  • size, shape and orientation
  • shape, size and orientation
  • none of these
The quantum numbers + 1⁄2 and –1/2 for the electron spin represent
  • rotation of the electron in clockwise and anticlockwise direction respectively
  • rotation of the electron in anticlockwise and clockwise direction respectively
  • magnetic moment of the electron pointing up and down respectively
  • two quantum mechanical spin states which have no classical analogues.
The correct order of increasing energy of atomic orbitals is
  • 5p < 4f < 6s < 5d
  • 5p < 6s < 4f < 5d
  • 4f < 5p < 5d < 6s
  • 5p < 5d < 4f < 6s
Which of the following ions has the maximum magnetic moment?
  • Mn2+
  • Fe2+
  • Ti2+
  • Cr2+
The number of d-electrons retained in Fe2+ (At. No. of Fe =ion is
  • 4
  • 5
  • 6
  • 3

Chemistry-Structure of Atom-8045.png

  • Chemistry-Structure of Atom-8046.png
  • 2)
    Chemistry-Structure of Atom-8047.png

  • Chemistry-Structure of Atom-8048.png

  • Chemistry-Structure of Atom-8049.png

Chemistry-Structure of Atom-8050.png

  • Chemistry-Structure of Atom-8051.png
  • 2)
    Chemistry-Structure of Atom-8052.png

  • Chemistry-Structure of Atom-8053.png

  • Chemistry-Structure of Atom-8054.png
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