Class XI

Rutherford’s α–particle scattering experiment supported the discovery of
  1. radioactivity
  2. electron
  3. nucleus
  4. proton
According to Pauli’s exclusion principle
  1. All electrons in an atom can have the same spin numbers
  2. No two electrons in an atom can have the same set of four quantum numbers
  3. Any two electrons in an atom can have the same spin numbers
  4. Any two electrons in an atom can have the same set of four quantum numbers
One of the following scientists was the first to discover electron
  1. James Chadwick
  2. Robert Hooke
  3. Ernest Rutherford
  4. J.J. Thomson
The Aufbau principle states : In the ground state of the atoms, the orbitals are filled in order of
  1. their increasing radius
  2. their increasing energies
  3. their decreasing energies
  4. their decreasing radius
Spin quantum number with two spin states of the electron represented by two arrows, ↑ (spin up) and ↓ (spin down) was introduced to account for
  1. the splitting of emission lines in an electric field
  2. the splitting of emission lines in a Magnetic field
  3. the splitting of emission lines in vacuum
  4. to account for uncertainty in electron states
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