CBSE  /  Class 11  /  Chemistry  /  Structures of Atom

  • 1. 
    The increasing order (lowest first) for the values of e/m (charge/mass) for

  • e, p, n, α
  • n, p, e, α
  • n, p, α, e
  • n, α, p, e

  • 2. 
    The ionization enthalpy of hydrogen atom is 1. 312 × 10J mol. The energy required to excite the electron in the atom from n = 1 to n = 2 is

  • 8. 51 × 10J mol
  • 6. 56 × 10J mol
  • 7. 56 × 10J mol
  • 9. 84 × 10J mol

  • 3. 
    or a given principal level n = 4, the energy of its subshells is in the order

  • s < p < d < f
  • s > p > d > f
  • s < p < f < d
  • f < p < d < s

  • 4. 
    A gas absorbs a photon of 355 nm and emits at two wavelengths. If one of the emissions is at 680 nm, the other is at:

  • 518 nm
  • 1035 nm
  • 325 nm
  • 743 nm

  • 5. 
    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 are of lower energy than 3d orbital
  • 3s, 3p and 3d orbitals all have the same energy

  • 6. 
    The magnetic quantum number specifies

  • Size of orbitals
  • Shape of orbitals
  • Orientation of orbitals
  • Nuclear Stability

  • 7. 
    The electronic configuration of silver atom in ground state is

  • [Kr]3d4s
  • [Xe]4f5d6s
  • [Kr]4d5s
  • [Kr]4d5s

  • 8. 
    Which of the following element has least number of electrons in its M-shell?

  • K
  • Mn
  • Ni
  • Sc

  • 9. 
    Which one of the following sets of ions represents a collection of isoelectronic species? (Atomic nos. : F = 9, Cl = 17, Na = 11, Mg = 12, Al = 13, K = 19, Ca = 20, Sc = 21)

  • K, Ca, Sc, Cl
  • Na, Ca, Sc, F
  • K, Cl, Mg, Sc
  • Na, Mg, Al, Cl

  • 10. 
    In the ground state, an element has 13 electrons in its M-shell. The element is_____.

  • Copper
  • Chromium
  • Nickel
  • Iron
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