Chapter 7: Structure Of Atoms Chemistry For High School - Grade 9(Chemistry ) Questions and Answers

Question 1. If n = 3 we are in
  1.    K shell
  2.    L shell
  3.    M shell
  4.    F shell
Explanation:-
Answer: Option C. -> M shell
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2. The energy of an electron in orbit is proportional to
  1.    distance between shells
  2.    distance from nucleus
  3.    distance between two nuclei
  4.    positive charge inside nucleus
Explanation:-
Answer: Option B. -> distance from nucleus
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 3. Electron revolves around the nucleus in orbits which have
  1.    variable energy
  2.    fixed energy
  3.    infinite energy
  4.    zero energy
Explanation:-
Answer: Option B. -> fixed energy
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 4. In Rutherford's experiment, α particles were deflected because of
  1.    electrostatic repulsion between α particles and positively charged part of atom
  2.    electrostatic attraction between α particles and positively charged part of atom
  3.    electrostatic repulsion between β particles and positively charged part of atom
  4.    electrostatic attraction between γ particles and positively charged part of atom
Explanation:-
Answer: Option A. -> electrostatic repulsion between α particles and positively charged part of atom
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 5. Water that contains H-2 atoms is called
  1.    heavy water
  2.    light water
  3.    pure water
  4.    chlorinated water
Explanation:-
Answer: Option A. -> heavy water
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 6. According to Rutherford, most of the space occupied by the atom is
  1.    filled
  2.    partially filled
  3.    empty
  4.    none of above
Explanation:-
Answer: Option C. -> empty
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 7. After 3s the sub-shell begin to fill is
  1.    3p
  2.    3d
  3.    3f
  4.    4s
Explanation:-
Answer: Option A. -> 3p
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 8. The electronic configuration is the arrangement of electrons in
  1.    nucleus
  2.    shells
  3.    sub-shells
  4.    all of above
Explanation:-
Answer: Option C. -> sub-shells
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 9. When an electron jumps from lower orbit to higher orbit
  1.    light is emitted
  2.    electrons are emitted
  3.    electrons are absorbed
  4.    light is absorbed
Explanation:-
Answer: Option D. -> light is absorbed
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 10. Electrons revolve only in those orbits with angular momentum as an
  1.    half integral multiple of 'h'
  2.    integral multiple of 'h'
  3.    integral multiple of h ⁄ 2π
  4.    half integral multiple of 2π
Explanation:-
Answer: Option C. -> integral multiple of h ⁄ 2π
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
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