JEE Questions for Chemistry Structure Of Atom Quiz 5 - MCQExams.com

For azimuthal quantum number l = 3, the maximum number of electrons will be
  • 2
  • 6
  • 0
  • 14
The electronic configuration of Cu (atomic numberis

  • Chemistry-Structure of Atom-7877.png
  • 2)
    Chemistry-Structure of Atom-7878.png

  • Chemistry-Structure of Atom-7879.png

  • Chemistry-Structure of Atom-7880.png
Which combinations of quantum numbers n, l, m and s for the electron in an atom does not provide a permissible solution of the wave equation?
  • 3, 2, –2, 1⁄2
  • 3, 3, 1, – 1⁄2
  • 3, 2, 1, 1⁄2
  • 3, 1, 1, – 1⁄2
How many electrons can have the values n = 2, l = 1 and s = + 1⁄2 in the configuration 1s22s22p3?
  • 1
  • 3
  • 5
  • 7
Electronic configuration of calcium atom can be written as
  • [Ne], 4p2
  • [Ar], 4s2
  • [Ne], 4s2
  • [Kr], 4p2
The probability of finding an electron residing in a px orbital is zero
  • in the yz plane
  • in the xy plane
  • in the y–direction
  • in the z–direction
From the given sets of quantum numbers, the one that is inconsistent with the theory is
  • n = 3; l = 2; m = –3; s = +1/2
  • n = 4; l = 3; m = 3; s = +1/2
  • n = 2; l = 1; m = 0; s = –1/2
  • n = 4; l = 3; m = 2 ; s = +1/2
The electron was shown experimentally to have wave properties by
  • de Broglie
  • Davisson and Germer
  • N. Bohr
  • Schrodinger
An element M has an atomic mass 19 and atomic number 9, its ion is represented by
  • M+
  • M2+
  • M−
  • M2−
The number of nodal planes in a px orbital is
  • one
  • two
  • three
  • zero
For which of the following species, Bohr’s theory is not applicable?
  • Be3+
  • Li2+
  • He2+
  • H
Identify the least stable among the following:
  • Li−
  • Be−
  • B−
  • C−q
An element M has an atomic mass 19 and atomic number 9. Its ion is represented by
  • M+
  • M2+
  • M−
  • M2−
Rutherford’s experiment which established the nuclear model of the atom used a beam of
  • β – particles which impinged on a metal foil and got absorbed
  • γ – rays which impinged on a metal foil and ejected electrons
  • helium atoms, which impinged on a metal foil and got scattered
  • helium nuclei, which impinged on a metal foil and got scattered
If the nitrogen atom had electronic configuration 1s7, it would have energy lower than that of the normal ground state configuration1s22s22p3 because the electrons would be closer to the nucleus. Yet 1s7 is not observed. It violates
  • Heisenberg’s uncertainty principle
  • Hund’s rule
  • Pauli exclusion principle
  • Bohr postulate of stationary orbits
The maximum number of electrons in a subshell having the same value of spin quantum number is given by
  • l + 2
  • 2l + 1
  • l(l + 1)

  • Chemistry-Structure of Atom-7883.png
What is wrong about anode rays?
  • Their e/m ratio is constant
  • They are deflected by electrical and magnetic field
  • They are produced by ionisation of molecules of the residual gas
  • Their elm ratio depends on nature of residual gas
Which of the following is not a characteristic of Planck’s quantum theory of radiations?
  • Radiations are associated with energy
  • Magnitude of energy associated with a quantum is equal to hv
  • Radiation energy is neither emitted nor absorbed continuously
  • A body can emit less or more than a quantum of energy
The conclusion that every additional electron enters the orbital with lowest possible energy has been drawn from
  • Pauli’s exclusion principle
  • Hund’s rule
  • Aufbau principle
  • de – Broglie’s equation.
Bohr’s model of atom is not in agreement with
  • Line spectra of hydrogen atom
  • Pauli’s principle
  • Planck’s theory
  • Heisenberg’s principle
Which of the following statements is correct?
  • All electromagnetic radiations do not possess the same velocity
  • Matter waves are associated with electrical and magnetic fields
  • Matter waves and electromagnetic radiations are alike
  • The velocityof matter wave is generally less than that of light
Which experimental observation correctly account for the phenomenon?
Chemistry-Structure of Atom-7884.png
  • a
  • b
  • c
  • d
In the Schrodinger’s wave equation ø represents
  • orbit
  • wave function
  • wave
  • radial probability
Which of the following gave the idea of a nucleus of the atom?
  • Oil drop experiment
  • Davissonand Germer’s experiment
  • α – ray scattering experiment
  • Austen’s mass spectrogram experiment
Cathode rays have same charge to mass ratio as
  • α – particles
  • β – rays
  • Anode rays
  • Protons
Rutherford’s experiment established that
  • inside the atom there are positive centres immersed in sea of electrons
  • nucleus contains protons, neutrons and mesons
  • most of the space in an atom is empty
  • all A, B and C
The total number of electrons in a subshell designated by azimuthal quantum number, l is given as
  • 2l + 1
  • l2
  • 4l + 2
  • 2l + 2
According to Bohr’s model of the atom, an electron can revolve around the atomic nucleus in a suitable orbit without emitting energy if its orbit
  • is a perfect circle
  • is a circle with a large radius
  • houses a whole number of de – Broglie waves
  • houses odd number of de – Broglie waves
Which of the following concerning Bohr’s model is false?
  • Predicts that probability of electron near nucleus is more
  • Angular momentum of electron in H atom
  • Introduces the idea of stationary states
  • Explains line spectrum of hydrogen
The kinetic energy of the electron in the nth orbit of an atom is given by the relation
  • Predicts that probability of electron near nucleus is more
  • Angular momentum of electron in H atom
  • Introduces the idea of stationary states
  • Explains line spectrum of hydrogen
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