Class 11 Chemistry · Chapter 2 · Test 1
Atomic Structure Chapter 2
35 MCQs
35 questions · 35 min · 35 marks
Want to try first? Take the free Chemistry test: Periodic Table Chapter 1
Sample questions
The first 5 of 35. Try each one, then tap to see the answer.
Question 1
The quantum number ‘m’ of a free gaseous atom is associated with:
- AThe effective volume of the orbital
- BThe shape of the orbital
- CThe spatial orientation of the orbital
- DThe energy of the orbital in the absence of a magnetic field
Show answerHide answer
Answer: C
Section 2.4.3 states that the magnetic quantum number m describes the orientation of an orbital in space within a subshell.
Question 2
When the 3d subshell is completely filled, the next entering electron goes into:
- A4f
- B4s
- C4p
- D4d
Show answerHide answer
Answer: C
The textbook's stated increasing-energy order places 4p after 3d: 4s < 3d < 4p.
Question 3
Quantum number values for 2p orbitals are:
- An = 2, l = 1
- Bn = 1, l = 2
- Cn = 1, l = 0
- Dn = 2, l = 0
Show answerHide answer
Answer: A
For a 2p orbital, the principal quantum number is n = 2 and the azimuthal quantum number for p is l = 1.
Question 4
An electron having the set of values n = 4, l = 0, m = 0 and s = +1/2 lies in:
- A2s
- B3s
- C4s
- D4p
Show answerHide answer
Answer: C
The textbook identifies l = 0 with an s subshell; n = 4 therefore indicates 4s, with m = 0 the only s-orbital orientation.
Question 5
The quantum number values (n, l, m) for the fourth electron of a Be atom (Z = 4) are:
- A1, 0, 0
- B2, 0, 0
- C2, 1, 0
- D1, 1, 1
Show answerHide answer
Answer: B
The textbook gives beryllium's configuration as 1s²2s². Its fourth electron is in 2s, where n = 2, l = 0 and m = 0.
Practise with a free account
Save your scores, see which chapters need work, and keep a notebook of every question you got wrong.