Class XI

One of the following scientists was the first to discover electron
  1. James Chadwick
  2. Robert Hooke
  3. Ernest Rutherford
  4. J.J. Thomson
According to Dalton’s atomic theory
  1. Atoms are made of electrons, neutrons and protons
  2. Atoms are made of neutrons and protons
  3. Atoms are indivisible
  4. Atoms are made of electrons and protons
Consider the ground state of Cr atom (Z = 24). The numbers of electrons with the azimuthal quantum numbers, l = 1 and 2 are, respectively:
  1. 16 and 4
  2. 16 and 5
  3. 12 and 4
  4. 12 and 5
According to quantum theoretical model of an atom each orbital is designated by three quantum numbers labelled as n, l and ml. These are referred to respectively as
  1. Principal quantum number, Azimuthal quantum number or orbital angular momentum and Magnetic orbital quantum number.
  2. Azimuthal quantum number or orbital angular momentum, Principal quantum number, and spin quantum number
  3. Principal quantum number, Azimuthal quantum number or orbital angular momentum and spin quantum number
  4. Azimuthal quantum number or orbital angular momentum, Principal quantum number, and Magnetic orbital quantum number.
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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