MCQ practice · SSC Chemistry Board questions · Chapter 3: Structure of Matter
For the revolving electron in the stem:
- i. An electron moving from level B to level C will absorb energy.
- ii. The angular momentum of an electron in level B is greater than in level A
- iii. While moving in level A the electron neither absorbs nor emits energy
Think it through first, then pick an option.
- a i and ii
- b i and iii
- c ii and iii
- d i, ii and iii
Answer and explanation
Correct answer: d i, ii and iii
Rising absorbs energy, mvr grows with n, and a steady level exchanges no energy: all three are true.
Why the other options are wrong
- a i and ii: iii is also true: while moving in level A the electron neither absorbs nor emits energy.
- b i and iii: ii is also true: B's n (2) is larger than A's (1), so its angular momentum is larger.
- c ii and iii: i is also true: moving from B (lower) to C (higher) absorbs energy.
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