Chapter No 1 :Structure of Atom (Classical Mechanics) (237 MCQ`S)

  1. En= -1311.8 KJ mol-1. If the value of E is -82 KJ mol-1 , to which value "n" corresponds?
    1. 2
    2. 3
    3. 4
    4. 5
    5. Show Answer
      Answer: C
      Explanation:
      • N/A
  2. Which of the following species has the same electronic configuration as that of argon atom?
    1. O-2
    2. K+
    3. Mg+2
    4. Na
    5. Show Answer
      Answer: B
      Explanation:
      • N/A
  3. The maximum number of electrons that can be accomodated in an orbit is;
    1. 2n
    2. 2n2
    3. n2
    4. 2n+1
    5. Show Answer
      Answer: B
      Explanation:
      • N/A
  4. Which one is not isoelectronic with rest of the followings?
    1. Cl-
    2. K+
    3. Al+3
    4. Ca+2
    5. Show Answer
      Answer: C
      Explanation:
      • Al+3 has 10 electrons while others have 18 electrons each
  5. The diameter of nucleus is of the order of:
    1. 10-13 cm
    2. 10-10 cm
    3. 10-8 cm
    4. 10-15 cm
    5. Show Answer
      Answer: A
      Explanation:
      • N/A
  6. The diameter of an atom is of the order of:
    1. 10-13 cm
    2. 10-10 cm
    3. 10-8 cm
    4. 10-15 cm
    5. Show Answer
      Answer: C
      Explanation:
      • N/A
  7. Which is not the unit of wavelength?
    1. Å
    2. cm-1
    3. nm
    4. µm
    5. Show Answer
      Answer: B
      Explanation:
      • cm-1 is the unit of wavenumber
  8. Which is not the unit of wavenumber?
    1. cm-1
    2. mm-1
    3. m-1
    4. nm
    5. Show Answer
      Answer: D
      Explanation:
      • N/A
  9. The wavelength of a violet light is 400 nm, its wavenumber is:
    1. 25 x 105 m-1
    2. 7.5 x 1014 m-1
    3. 4 x 10-9 m
    4. 0.025 nm
    5. Show Answer
      Answer: A
      Explanation:
      • wavenumber = 1/λ = 1/400 nm = 25 x 10+5 m-1
  10. The wave number of light emitted by a certain source is 2 x 106m, its wavelength is:
    1. 500 m
    2. 500 nm
    3. 200 nm
    4. 5 x 107 m
    5. Show Answer
      Answer: B
      Explanation:
      • λ = 1 / wavenumber

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