JEE Questions for Chemistry Structure Of Atom Quiz 15 - MCQExams.com

The wave number of first line of Balmer series of hydrogen is 15200 cm-1. The wave number of first Balmer line of Li2+ ion is
  • 15,200 cm-1
  • 60,800 cm-1
  • 76,000 cm-1
  • 136,800 cm-1
What transition in the hydrogen spectrum would have the same wavelength as the Balmer transition, n = 4 to n = 2 in the He+ spectrum?
  • n = 4 to n = 1
  • n = 3 to n =2
  • n = 3 to n = 1
  • n = 2 to n = 1
In a Bohr model of an atom, when an electron jumps from n = 3 to n = 1, how much energy will be emitted?

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    Chemistry-Structure of Atom-8226.png

  • Chemistry-Structure of Atom-8227.png

  • Chemistry-Structure of Atom-8228.png
At 200oC, the velocity of hydrogen molecule is 2.0 × 105 cm/sec. In this case the de Broglie wavelength is about
  • 1 Å
  • 1000 Å
  • 100 Å
  • 10 Å
What is the wavelength of a car with a mass of 1.3 × 104 g moving at a speed of 1.0 × 103 cm/sec?
(Planck’s constant 6.63 × 10−27 erg sec.)

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    Chemistry-Structure of Atom-8232.png

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The uncertainty in the position of an electron (mass = 9.1 × 10−28 g) moving with a velocity of 3.0 × 104 cms−1 accurate upto 0.011% will be
  • 1.92 cm
  • 7.68 cm
  • 0.175 cm
  • 3.84 cm
A proton is about 1840 times heavier than an electron. When it is accelerated by a potential difference of 1 kV, its kinetic energy will be
  • 1840 keV
  • 1/1840 keV
  • 1 keV
  • 920 keV
Potential energy of Li2+ electron is

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    Chemistry-Structure of Atom-8238.png

  • Chemistry-Structure of Atom-8239.png

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When electron transition occurs from higher energy state to a lower energy state with energy difference equal to ∆E electron volts, the wavelength of line emitted is approximately equal to

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    Chemistry-Structure of Atom-8248.png

  • Chemistry-Structure of Atom-8249.png

  • Chemistry-Structure of Atom-8250.png
A certain metal when irradiated by light (v = 3.2 × 1016Hz) emits photoelectrons with twice kinetic energy as did photo electrons when the same metal is irradiated by light (v = 2 × 1016Hz). The 0 v of metal is

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    Chemistry-Structure of Atom-8253.png

  • Chemistry-Structure of Atom-8254.png

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The correct Schrodinger’s wave equation for an electron with E as total energy and V as potential energy is

  • Chemistry-Structure of Atom-8257.png
  • 2)
    Chemistry-Structure of Atom-8258.png

  • Chemistry-Structure of Atom-8259.png

  • Chemistry-Structure of Atom-8260.png
The units for equation are

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  • 2)
    Chemistry-Structure of Atom-8262.png

  • Chemistry-Structure of Atom-8263.png

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The transition in He+ ion that would have the same wave number as the first Lyman line in hydrogen spectrum is
  • 2 → 1
  • 5 → 3
  • 4 → 2
  • 6 → 4
The work function of a metal is 4.2 eV. If radiations of 2000 Å fall on the metal then the kinetic energy of the fastest photo electron is

  • Chemistry-Structure of Atom-8267.png
  • 2)
    Chemistry-Structure of Atom-8268.png

  • Chemistry-Structure of Atom-8269.png

  • Chemistry-Structure of Atom-8270.png
An electron of a velocity ‘’ is found to have a certain value of de-Broglie wavelength. The velocity to be possessed by the neutron to have the same de-Broglie wavelength is
  • v
  • 2)
    Chemistry-Structure of Atom-8271.png
  • 1840v

  • Chemistry-Structure of Atom-8272.png
The momentum of a particle associated with de-Broglie’s wave length of 6 Å is

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  • 2)
    Chemistry-Structure of Atom-8275.png

  • Chemistry-Structure of Atom-8276.png

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Frequency of matter wave is equal to v = frequency, v = velocity of particle
  • (K.E.)/2h
  • 2.(KE.)/h
  • (K.E./h)
  • λ
The ratio of K.E. to P.E. of an electron in Bohr orbit of H like species is
  • 1 : 2
  • –1 : 2
  • 1 : 1
  • –1 : 1
In one joule of energy, the number of photon with wave number equal to is
  • (hcx)–1
  • x(hc)–1
  • (hcx)
  • hc(x)–1
The ratio of energy of the electron in ground state of hydrogen to the electron in first excited state of Be+3 is
  • 1: 4
  • 1: 8
  • 1: 16
  • 16: 1
In the Bohr’s orbit, what is the ratio of total kinetic energy and total energy of the electron
  • –1
  • –2
  • 1
  • 2
Which of the following is violation of Pauli’s exclusion principle ?

  • Chemistry-Structure of Atom-8283.png
  • 2)
    Chemistry-Structure of Atom-8284.png

  • Chemistry-Structure of Atom-8285.png

  • Chemistry-Structure of Atom-8286.png
0:0:1


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