MCQs on Structure of Atom

MCQs on Structure of Atom

1. How many orbitals can have the following set of quantum numbers, n = 3, l = 1, m₁ = 0 ?

(a) 3

(b) 1

(c) 4

(d) 2

Answer: (b)

2. Electronic configuration of the outer shell of the element Gd with atomic number 64 is

(a) 4f⁴ 5d⁵ 6s¹

(b) 4f³ 5d⁵ 6s²

(c) 4f⁵ 5d⁴ 6s¹

(d) 4f⁷ 5d¹ 6s²

Answer: (d)

3. Maximum number of electrons in a subshell can be

(a) 4l + 2

(b) 4l – 2

(c) 2n²

(d) 2l + 1

Answer: (a)

4. The orientation of atomic orbitals depends on their

(a) spin quantum number

(b) magnetic quantum number

(c) azimuthal quantum number

(d) principal quantum number

Answer: (b)

5. A gas X has C_p and C_v ratio as 1.4, at NTP 11.2 L of gas X will contain_______ number of atoms

(a) 1.2 × 10²³

(b) 3.01 × 10²³

(c) 2.01 × 10²³

(d) 6.02 × 10²³

Answer: (d)

6. Number of unpaired electrons in N²⁺

(a) 3

(b) 1

(c) 2

(d) 0

Answer: (b)

7. The excitation energy of a hydrogen atom from its ground state to its third excited state is

(a) 12.75 eV

(b) 0.85 eV

(c) 10.2 eV

(d) 12.1 eV

Answer: (a)

8. 3p orbital has _____ radial nodes

(a) three

(b) two

(c) one

(d) none

Answer: (c)

9. A 0.66 kg ball is moving with a speed of 100 m/s. Find its wavelength

(a) 6.6 × 10^-34 m

(b) 6.6 × 10^-32 m

(c) 1.0 × 10^-32 m

(d) 1.0 × 10^-35 m

Answer: (d)