JEE Questions for Chemistry Structure Of Atom Quiz 8 - MCQExams.com

The ratio of specific charge of a proton and an α – particle is
  • 2 : 1
  • 1 : 2
  • 1 : 4
  • 1 : 1
Which of the following sets of quantum numbers belongs to highest energy ?

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  • 2)
    Chemistry-Structure of Atom-7898.png

  • Chemistry-Structure of Atom-7899.png

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According to Bohr’s theory, the energy required for the transition of H atom from n = 6 to n = 8 state is
  • equal to energy required for the transitions from n = 5 to n = 7 state
  • larger than in (A)
  • less than in (A)
  • equal to energy for the transition from n = 7 to n = 9 state
What will be de – Broglie wavelength of an electron moving with a velocity of 1·20 × 105ms–1?

  • Chemistry-Structure of Atom-7901.png
  • 2)
    Chemistry-Structure of Atom-7902.png

  • Chemistry-Structure of Atom-7903.png

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The third line of the Balmer series. in the emission spectrum of the hydrogen atom, is due to the transition from the
  • fourth Bohr orbit to the first Bohr orbit
  • fifth Bohr orbit to the second Bohr orbit
  • sixth Bohr orbit to the third Bohr orbit
  • seventh Bohr orbit to the third Bohr orbit
The highest number of unpaired electrons are w present in
  • Fe°
  • Fe4+
  • Fe2+
  • Fe3+
Rutherford’s atomic model suggests the existence
  • Atom
  • Nucleus
  • α – particle
  • Mesons
Which is not true with respect to cathode rays?
  • A stream of electrons
  • Charged particles
  • Move with speed as that of light
  • Can be deflected by magnetic fields
A element M has an atomic mass 19 and atomic number 9. Its ion is represented by
  • M+
  • M2+
  • M–
  • M2–
Which of the following ions has the maximum magnetic moment ?
  • Mn2+
  • Fe2+
  • Ti2+
  • Cr2+
The value of the energy for the first excited state of hydrogen will be
  • –13·6eV
  • –3·40eV
  • –1.51eV
  • –0·85eV
In hydrogen atom, energy of first excited state is -3·4 eV. Find out the K.E. of the same orbit of hydrogen atom
  • +3·4eV
  • +6·8eV
  • –13·6eV
  • +13·6eV
The energy of the first electron in helium will be
  • –13·6eV
  • –54·4eV
  • –5·44eV
  • zero
In a hydrogen atom, if the energy of an electron in the ground state is 13·6 eV, then that in the 2nd excited state is
  • 1·51eV
  • 3·4eV
  • 6·04eV
  • 13·6eV
The ratio between kinetic energy and the total f energy of the electrons of hydrogen atom according to Bohr’s model is
  • 2 : 1
  • 1 : 1
  • 1 : (–1)
  • 1 : 2
In Bohr series of lines of hydrogen spectrum, the third line from the red end corresponds to which one of the following inter-orbit jumps of the electron for Bohr orbits in an atom of hydrogen ?
  • 3 → 2
  • 5 → 2
  • 4 → 1
  • 2 → 5
The atomic number of an element is 35. What is the total number of electrons present in all the p-orbitals of the ground state atom of that element?
  • 6
  • 11
  • 17
  • 23
Which of the following sets of quantum numbers is correct for an electron in 4f – orbital ?

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    Chemistry-Structure of Atom-7908.png

  • Chemistry-Structure of Atom-7909.png

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The wavelength of radiation emitted when in a hydrogen atom electron falls from infinity to stationary state 1, would be (Rydberg constant = 1·09 × 107 m–1)
  • 91nm
  • 9·1 × 10–8 nm
  • 406 nm
  • 192 nm
Which of the following statements in relation to the hydrogen atom is correct?
  • 3s – orbital is lower in energy than 3p-orbital
  • 3p – orbital is lower in energy than 3d-orbital
  • 3s and 3p orbitals arc of lower energy than 3d orbital
  • 3s, 3p and 3d orbitals all have the same energy
If the speed of electron in Bohr first orbit of hydrogen atom be x, then speed of the electron in 3rd orbit is
  • x/9
  • x/3
  • 3x
  • 9x
The wave number of first line of Balmer series of hydrogen is 15200 cm–1. The wave number of the first Balmer line of Li+1 ion is
  • 15200 cm–1
  • 60800 cm–1
  • 76000cm–1
  • 136,800cm–1
The radius of which of the following orbits is same as that of the first Bohr’s orbit of hydrogen atom ?
  • He+ (n = 2)
  • Li2+ (n = 2)
  • Li2+ (n = 3)
  • Be3+ (n = 2)
A cricket ball of 0.5 kg is moving with a velocity of 100 m/s. The wavelength associated with its motion is
  • 0.01 cm
  • 6.6 × 10-34 m
  • 1.32 × 10-35 m
  • 6.6 × 10-28 m
What is the frequency of photon whose momentum is 1.1 × 10-23 kg ms-2 ?
  • 5 × 1016 Hz
  • 5 × 1017 Hz
  • 0.5 × 1018 Hz
  • 5 × 1018 Hz
What accelerating potential is needed to produce an electron beam with an effective wavelength of 0.090 Å ?
  • 1.86 × 104 eV
  • 1.86 × 102 eV
  • 2.86 × 104 eV
  • 2.86 × 102 eV
The uncertainty in the momentum of an electron is 1.0 × 10-5 kg ms-1. The uncertainty in its position will be
  • 1.50 × 10-28 m
  • 1.05 × 10-26 m
  • 5.27 × 10-30 m
  • 5.25 × 10-28 m
Which of the following sets of quantum numbers is correct ?
  • n = 5, l = 4, m = 0, s = +1/2
  • n = 3, l = 3, m = +3, s = + 1/ 2
  • n = 6, l = 0, m = +1, s = -1/ 2
  • n = 4, l = 2, m = +2, s = 0
Rutherford’s experiment on scattering of particles showed for the first time that the atom has
  • Electrons
  • Protons
  • Nucleus
  • Neutrons
The principal quantum number of an atom is related to the
  • size of the orbital
  • spin angular momentum
  • orbital angular momentum
  • orientation of the orbital in space
0:0:1


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