JEE Questions for Chemistry Structure Of Atom Quiz 14 - MCQExams.com

Magnitude of kinetic energy in an orbit is equal to
  • half of the potential energy
  • twice of the potential energy
  • one fourth of the potential energy
  • None of the above
The H-spectrum show
  • Heisenberg's uncertainty principle
  • diffraction
  • polarisation
  • presence of quantised energy level
If λ0 is the threshold wavelength for photoelectric emission, λ the wavelength of light falling on the surface of a metal and m the mass of the electron, then the velocity of ejected electron is given by

  • Chemistry-Structure of Atom-8242.png
  • 2)
    Chemistry-Structure of Atom-8243.png

  • Chemistry-Structure of Atom-8244.png

  • Chemistry-Structure of Atom-8245.png
Which of the following statements does not form a part of Bohr's model of hydrogen atom ?
  • Energy of the electrons in the orbit is quantised
  • The electron in the orbit nearest the nucleus has the lowest energy
  • Electrons revolve in different orbits around the nucleus
  • The position and velocity of the electrons in the orbit cannot be determined simultaneously
Energy of H-atom in the ground state is -13.6 eV, hence energy in the second excited state is
  • -6.8 eV
  • -3.4 eV
  • -1.51 eV
  • -4.53 eV
The energy required to remove an electron from metal X is E = 3.31 × 10-20 J. Calculate the maximum wavelength of light that can photo eject an electron from metal X
  • 6.01 × 10-6m
  • 3.01 × 10-3m
  • 5.01 × 10-6m
  • None of these
Energy of one mole of photons of radiation whose frequency is 5 × 1014 Hz is
  • 199.51 kJ mol-1
  • 189.51 kJ mol-1
  • 198.51 kJ mol-1
  • 188.51 kJ mol-1
Calculate the velocity of an electron having wavelength of 0.15 nm Mass of an electron is 9.109 × 10-28 g.
(h = 6.626 × 10-27 erg-s).
  • 2.062 × 10-8 cm∙s-1
  • 2.062 × 10-15 cm∙s-1
  • 4.84 × 108 cm∙s-1
  • 2.062 × 10-9 cm∙s-1
If helium atom and hydrogen molecule are moving with the same velocity, their wavelength ratio will be
  • 4 : 1
  • 1 : 2
  • 2 : 1
  • 1 : 4
A particle having a mass of 1.0 mg has a velocity of 3600 km/h. Calculate the wavelength of the particle.
(h = 6.626 × 10-27 erg-s)
  • 6.626 × 10-28 cm
  • 6.626 × 10-29 cm
  • 6.626 × 10-30 cm
  • 6.626 × 10-31 cm
In an atom, an electron is moving with a speed of 600 m/s with an accuracy of 0.005%. Certainity with which the position of the electron can be located is (h = 6.6 × 10-34 kg m2s-1, mass of electron, em = 9.1 × 10-31 kg)
  • 1.52 × 10-4 m
  • 5.10 × 10-3 m
  • 1.92 × 10-3 m
  • 3.84 × 10-3 m
Calculate the wavelength (in nanometer) associated with a proton moving at 1.0 × 103ms-1 (Mass of proton = 1.67 × 10-27 kg and h = 6.63 × 10-34 Js)
  • 0.032 nm
  • 0.40 nm
  • 2.5 nm
  • 14.0 nm
A body of mass x kg is moving with a velocity of 100 ms-1. Its de-Broglie wavelength is 6.62 × 10-35 m. Hence, x is
(h = 6.62 × 10-34 Js)
  • 0.1 kg
  • 0.25 kg
  • 0.15 kg
  • 0.2 kg
Which of the following is the correct form of Schrodinger wave equation ?

  • Chemistry-Structure of Atom-8183.png
  • 2)
    Chemistry-Structure of Atom-8184.png

  • Chemistry-Structure of Atom-8185.png

  • Chemistry-Structure of Atom-8186.png
A particle moving with a velocity 106 m/s will have de-Broglie wavelength nearly,
(given, m = 6.62 × 10-27 kg, h = 6.62 × 10-34 J-s)
  • 10-9 m
  • 10-13 m
  • 10-19 m
  • 1 Å
The velocities of two particles A and B are 0.05 and 0.02 ms-1 respectively. The mass of B is five times the mass of A. The ratio of their de-Broglie's wavelength is
  • 2 : 1
  • 1 : 4
  • 1 : 1
  • 4 : 1
Which of the following expressions gives the de-Broglie relationship

  • Chemistry-Structure of Atom-8190.png
  • 2)
    Chemistry-Structure of Atom-8191.png

  • Chemistry-Structure of Atom-8192.png

  • Chemistry-Structure of Atom-8193.png
The de-Broglie wavelength of a tennis ball of mass 60 g moving with a velocity of 10 m/s is approximately
(Planck's constant, h = 6.63 × 10-34 Js )
  • 10-33 m
  • 10-31 m
  • 10-16 m
  • 10-25 m
A body of mass 10 mg is moving with a velocity of 100 ms-1. The wavelength of de-Broglie wave associated with it would be (h = 6.63 × 10-34 Js)
  • 6.63 × 10-35 m
  • 6.63 × 10-34 m
  • 6.63 × 10-31 m
  • 6.63 × 10-37 m
The probability of finding the electron in the orbital is
  • 100%
  • 90-95%
  • 70-80%
  • 50-60%
Wave nature of electrons was demonstrated by
  • Schrodinger
  • de-Broglie
  • Davisson and Garmer
  • Heisenberg

Chemistry-Structure of Atom-8198.png
  • 2
  • 0.25
  • 4
  • 1
An electron is moving in Bohr's fourth orbit. Its de-Broglie wavelength is λ. What is the circumference of the fourth orbit?

  • Chemistry-Structure of Atom-8200.png
  • 2λ
  • 4λ

  • Chemistry-Structure of Atom-8201.png
Which of the following is Heisenberg uncertainty principle ?

  • Chemistry-Structure of Atom-8203.png
  • 2)
    Chemistry-Structure of Atom-8204.png

  • Chemistry-Structure of Atom-8205.png

  • Chemistry-Structure of Atom-8206.png
Uncertainty in position of a particle of 25 g in space is 10-5 m. Hence, uncertainty in velocity (ms-1) is
(Planck's constant h = 6.6 × 10-34 Js)
  • 2.1 × 10-28
  • 2.1 × 10-34
  • 0.5 × 10-34
  • 5.0 × 10-24
If the speed of electron in the Bohr’s first orbit of hydrogen atom be x, then speed of the electron in the 3rd orbit is
  • x/9
  • x/3
  • 3x
  • 9x
For an electron if the uncertainty in velocity is ∆v , the uncertainty in its position ( ∆x ) is given by

  • Chemistry-Structure of Atom-8215.png
  • 2)
    Chemistry-Structure of Atom-8216.png

  • Chemistry-Structure of Atom-8217.png

  • Chemistry-Structure of Atom-8218.png
The configuration 1s22s22p53s1 shows
  • ground state of fluorine
  • excited state of fluorine
  • excited state of Neon atom

  • Chemistry-Structure of Atom-8220.png
Which of the following has more unpaired d-electrons?
  • Zn+
  • Fe2+
  • Ni3+
  • cu+
The energy of a photon is given as ∆E /atom = 3.03 × 10−19 J atom−1. Then the wavelength (λ) of the photon is.
  • 65.6 nm
  • 656 nm
  • 0.656 nm
  • 6.56 nm
0:0:1


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