JEE Questions for Chemistry Structure Of Atom Quiz 2 - MCQExams.com

The highest number of unpaired electrons are in
  • Fe
  • Fe2+
  • Fe3+
  • All have equal number of unpaired electrons
According to Aufbau principle, the correct order of energy of 3d, 4s and 4p-orbitals is
  • 4p < 3d < 4s
  • 4s < 4p < 3d
  • 4s < 3d < 4p
  • 3d < 4s < 4p
The stability of ferric ion is due to
  • half filled f -orbitals
  • half filled d -orbitals
  • completely filled f -orbitals
  • completely filled d -orbitals
Which among the following species have the same number of electrons in its outermost as well as penultimate shell ?
  • Mg2+
  • O2-
  • F-
  • Ca2+
The valence shell electronic configuration of Cr2+ ion is
  • 4s0 3d 4
  • 4s2 3d 2
  • 4s2 3d 0
  • 3p6 4s2
Electronic configuration of deuterium atom is
  • 1s1
  • 2s2
  • 2s1
  • 1s2
A p-orbital in a given shell can accommodate upto
  • four electrons
  • two electrons with parallel spin
  • six electrons
  • two electrons with opposite spin
Electrons will first enter into the set of quantum numbers n = 5, l = 0 or n = 3, l = 2
  • n = 5, l = 0
  • both possible
  • n = 3, l = 2
  • data insufficient
The value of Rydberg constant is
  • 109678 cm-1
  • 109876 cm-1
  • 107876 cm-1
  • 108976 cm-1
The wavelength of a spectral line in Lyman series, when electron jumps back from 2nd orbit, is
  • 1162 Å
  • 1216 Å
  • 1362 Å
  • 1176 Å
The number of waves in an orbit are
  • n2
  • n
  • n - 1
  • n - 2
Zeeman effect refers to the
  • splitting up of the lines in an emission spectrum in the presence of an external electrostatic field
  • random scattering of light by colloidal particles
  • splitting up of the lines in an emission spectrum in a magnetic field
  • emission of electrons from metals when light falls upon them
The position of both, an electron and a helium atom is known within 1.0 nm. Further the momentum of the electron is known within 5.0 × 10–26 kg ms–1. The minimum uncertainty in the measurement of the momentum of the helium atom is
  • 50 kg ms–1
  • 80 kg ms–1
  • 8.0 × 10–26 kg ms–1
  • 5.0 × 10–26 kg ms–1
The energy of a photon is 3 × 10-12 ergs. What is its wavelength in nm ?
( h = 6.62 × 10-27 ergs, c = 3 × 1010 cm/s )
  • 662
  • 1324
  • 66.2
  • 6.62
What is the energy (in eV) required to excite the electron from n =1 to n = 2 state in hydrogen atom ?
( n = principal quantum number)
  • 13.6
  • 3.4
  • 17.0
  • 10.2
Energy of photon of visible light is
  • 1 eV
  • 1 MeV
  • 1 ev
  • 1 KeV
As per de-Broglie's formula a macroscopic particle of mass 100 g and moving a velocity of 100 cm s-1 will have a wavelength of
  • 6.6 × 10-29 cm
  • 6.6 × 10-30 cm
  • 6.6 × 10-31 cm
  • 6.6 × 10-32 cm
Which of the following does not represent the mathematical expression for the Heisenberg uncertainty principle?
  • Δx ∙ Δp ≥ h/(4π)
  • Δx ∙ Δv ≥ h/(4πm)
  • ΔE ∙ Δt ≥ h/(4π)
  • ΔE ∙ Δx ≥ h/(4π)
Uncertainty in the position of an electron (mass = 9.1 × 10-31 kg) moving with a velocity 300 ms-1 accurate upon 0.001 % will be (h = 6.63 × 10-34 Js)
  • 19.2 × 10-2 m
  • 5.76 × 10-2 m
  • 1.93 × 10-2 m
  • 3.84 × 10-2 m
In an atom, the total number of electrons having quantum numbers n = 4, |ml| = 1 and ms = - 1/ 2 is
  • 3
  • 2
  • 6
  • 9
The correct set of four quantum number for the valence electrons of rubidium atom (Z =is
  • 5, 0, 0, + 1/2
  • 5, 1, 0, + 1/2
  • 5, 1, 1, + 1/2
  • 5, 0, 1, + 1/2
Which of the following sets of quantum numbers could represent the last electron added to complete the electron configuration for a ground state atom of Br (Z =according to the Aufbau principle n : l ; ml ; ms
  • 4; 0; 0; - 1/2
  • 4; 1; 1; -1/2
  • 3; 1; 1; -1/2
  • 4; 1; 2; + 1/2
The energy absorbed by each molecule (A2) of a substance is 4.4 × 10–19 J and bond energy per molecule is 4.0 × 10–19 J. The kinetic energy of the molecule per atom will be:
  • 2.2 × 10–19 J
  • 2.0 × 10–19 J
  • 4.0 × 10–20 J
  • 2.0 × 10–20 J
If the energy of a photon is given as 3.03 × 10–19 J then, the wavelength (λ) of the photon is :
  • 6.56 nm
  • 65.6 nm
  • 656 nm
  • 0.656 nm
The magnetic quantum number for d-orbital is given by
  • 2
  • 0, ± 1, ± 2
  • 0, 1, 2
  • 5
The maximum number of electrons that can have principal quantum number, n = 3 and spin quantum number, ms = - (1/2), is
  • 3
  • 5
  • 7
  • 9
Which one of the following sets of quantum numbers represents the highest energy level in an atom?
  • n = 4, l = 0, m = 0, s = + 1/ 2
  • n = 3, l = 1, m = 1, s = +1/ 2
  • n = 3, l = 2, m = -2, s = + 1/ 2
  • n = 3, l = 0, m = 0, s = +1/ 2
Which of the following is correct for number of electrons, number of orbitals and type of orbitals respectively in n-orbit ?
  • 4, 4 and 8
  • 4, 8 and 16
  • 32, 16 and 4
  • 4, 16 and 32
Electron density in the yz plane of 3dx2-y2 orbital is
  • Zero
  • 0.50
  • 0.75
  • 0.90
Which of the following sets of quantum numbers represents the highest energy of an atom ?
  • n = 3 , l = 1, m = 1, s = +1/2
  • n = 3, l = 2, m = 1, s = +1/2
  • n = 4, l = 0, m = 0, s = +1/2
  • n = 3, l = 0, m = 0, s = +1/2
0:0:1


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