JEE Questions for Chemistry Structure Of Atom Quiz 7 - MCQExams.com

In two H atoms A and 13 the electrons move around the nucleus in circular orbits of radius r and 4r respectively. The ratio of the times taken by them to complete one revolution is
  • 1: 4
  • 1: 2
  • 1: 8
  • 2: 1
The energy required to dislodge electron from excited isolated H atom (IE1 = 13.6eV) is
  • = 13.6eV
  • > 13.6eV
  • < 13.6eVand > 3.4eV
  • 3.4eV
Velocity of electron in the first orbit of H-atom is compared to that of velocity of light is approximately

  • Chemistry-Structure of Atom-7890.png
  • 2)
    Chemistry-Structure of Atom-7891.png

  • Chemistry-Structure of Atom-7892.png
  • same
How many electrons in Cu atom have (n + ) = 4
  • 6
  • 7
  • 8
  • 4
In any subshell the maximum number of electrons having same value of spin quantum number is

  • Chemistry-Structure of Atom-7893.png
  • l + 2
  • 2l
  • 4l + 2
How many electrons in K (Z =have n = 4 and ?
  • 1
  • 2
  • 3
  • 4
Suggest two transitions in hydrogen spectrum for which wave number ratio is 108:7
  • 2 → 1, 3 → 1
  • 2 → 1, 4 → 3
  • 2 → 1, 5 → 4
  • 2 → 1, 4 → 1
One unpaired electron causes magnetic moment of 1.1 B.M. The magnetic moment of Fe+2 ion is
  • 4.4
  • 5.5
  • 2.2
  • 0
Number of waves made by a Bohr electron in one complete revolution in its fourth orbit is
  • 2
  • 3
  • 4
  • infinite
Which of the following electronic transitions require that the greatest amount of energy be absorbed by a hydrogen atom?
  • n = 1 to n = 2
  • n = 2 to n = 4
  • n = 3 to n = 6
  • n = 0 to n = 1
The radius of first Bohr orbit is , then de-Broglie wavelength of electron in 3rd orbit is nearly
  • 2πx
  • 6πx
  • 9x
  • x/3
With increasing principle quantum number, the energy difference between adjacent energy levels in H atom
  • decreases
  • increases
  • remains constant
  • decreases for low value of Z and increases for higher value of Z
The electrons present in K – shell of the atom will differ in
  • principal quantum number
  • azimuthal quantum number
  • magnetic quantum number
  • spin quantum number
The ratio of the ionization energy of H and Be3+ is..............
  • 1: 1
  • 1: 3
  • 1 : 9
  • 1: 16
The maximum number of electrons in a subshell for which l = 3 is
  • 14
  • 10
  • 8
  • 4
The number of electrons in the M shell of the element with atomic number 24 is
  • 24
  • 12
  • 13
  • 8
Sodium chloride imparts a yellow colour to the Bunsen flame. This can be interpreted due to the
  • low ionization energy of sodium
  • sublimation of metallic sodium to give yellow vapour
  • emission of excess energy absorbed as a radiation in the visible region
  • photosensitivity of sodium
The exact path of electron 2p – orbital cannot be determined.” The above statement is based upon
  • Hund’s Rule
  • Bohr’s Rule
  • Uncertainty principle
  • Aufbau principle
The maximum number of electrons in a subshell is given by the expression
  • 4l – 2
  • 4l + 2
  • 2l + 1
  • 2n2
If r is the radius of first orbit, the radius of nth orbit of the H atom will be
  • rn2
  • rn
  • r/n
  • r2n2
At 200°C hydrogen molecules have velocity 105 cm sec–1. The de-Broglie wavelength in this case is approximately
  • 2 Å
  • 1000 Å
  • 100 Å
  • 10 Å
The number of electrons in 3d shell for element with atomic number 26 is
  • 4
  • 6
  • 8
  • 10
In a set of degenerate orbitals the electrons distribute themselves to retain similar spins as far as possible. This statement is attributed to
  • Pauli’s exclusion principle
  • Aufbau principle
  • Hund’s Rule
  • Slater rules
If uncertainty in the position of electron is zero, the uncertainty in its momentum would be
  • zero
  • 2)
    Chemistry-Structure of Atom-7895.png

  • Chemistry-Structure of Atom-7896.png
  • infinite
The radius of second Bohr’s orbit is
  • 0·053 nm
  • 0·053/4 nm
  • 0·053 × 4nm
  • 0·053 × 20 nm
For which of the following sets of quantum -numbers an electron will have the highest energy ?
  • 3, 2, 1, 1/2
  • 4, 2, -1, 1/2
  • 4, 1, 0, -1/2
  • 5, 0, 0, 1/2
The uncertainty in the position of an electron (mass 9.1 × 10–28 g) moving with a velocity of 3.0 x 104 cms–1 accurate up to 0.011% will be
  • 1·92 cm
  • 7·68 cm
  • 0·175 cm
  • 3·84cm
The radius of hydrogen atom in the ground state is 0·53 Å, the radius of 3Li2+ in the similar state is
  • 1·06 Å
  • 0·265Å
  • 0·17 Å
  • 0·53 Å
Splitting of spectral lines under the influence of magnetic field is called
  • Stark effect
  • Zeeman effect
  • Photoelectric effect
  • None of these
The total number of orbitals in a shell with principal quantum number ‘n’ is
  • 2n
  • 2n2
  • n2
  • n + 1
0:0:1


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