Structure of Atom MCQ Questions and Answers for Practice

1. For which of the following set of quantum numbers, an electron will have the highest energy?

1. 3, 2, +1, +1/2
2. 4, 1, 0, -1/2
3. 4, 2, -1, +1/2
4. 5, 0, 0, +1/2

2. Which of the following atoms or ion/atom have identical ground state configuration?

1. Li⁺ and He⁺
2. Na and K
3. Cl^- and Ar
4. F⁺ and Ne

3. A g-sub shell is characterized by

1. n=5
2. m=3
3. l= 4
4. l= 5

4. Which expression represents de-Broglie relationship?

1. h/mv = ρ
2. λ= h/mρ
3. h/mv = λ
4. mλ = v/ρ

5. The number of spherical nodes for 4d orbital is

1. Zero
2. Two
3. One
4. Three

6. The configuration 1s², 2s², 2p⁵, 3s¹ shows

1. Ground state of fluorine
2. Excited state of neon
3. Excited state of fluorine
4. Excited state of O₂^- ion

7. The electronic configuration of Cu⁺² ion is;

1. [Ar} 4s¹ 3d⁸
2. [Ar] 4s¹ 3d¹⁰
3. [Ar] 4s² 3d¹⁰ 4p¹
4. [Ar] 3d⁹

8. Which of the following orbitals has dumb-bell shape

1. s
2. p
3. d
4. f

9. The total number of orbitals in a shell having principle quantum number n is;

1. 2n
2. n²
3. 2n²
4. (n+l)

10. Bohrs radius for H-atom(n=1) is approximately0.53A^o. The radius of the first excited (n=2) is;

1. 0.13 A^o
2. 1.06A^o,
3. 4.77A^o
4. 2.12A^o

11. The species which is not paramagnetic among the following is;

1. Cl^-
2. Be^-
3. Ne⁺²
4. As⁺

12. What is the wavelength of light. Given energy =3.03 x 10^-19 j, h=6.62 x 10^-34 js and c=3.0 x 10 ⁸ m/s?

1. 6.54nm
2. 654nm
3. 0.654nm
4. 65.4 nm

13. The following quantum numbers are possible for how many electrons? n=3, l=2, m=+2

1. 1
2. 2
3. 18
4. 4

14. Azimuthal quantum number defines

1. e/m ratio of electron
2. Angular momentum of electron
3. Spin of electron
4. Magnetic momentum of an electron

15. The correct order of increasing energy of atomic orbitals is

1. 5p<4f<6s<5d
2. 4f<5p<5d<6s
3. 5p<6s<4f<5d
4. 5p<5d<4f<6s