Quiz Tweek

Preparing your workspace...

Atomic Structure MCQ Online Practice Test | Class 11 | Quiz Tweek

Atomic Structure

Practice Important MCQs for Atomic Structure — Chemistry, Class 11.

The "Structure of Atom" is a fundamental chapter in Class 11 Chemistry that bridges the gap between classical physics and quantum mechanics. For CBSE Board exams, this chapter is crucial as it forms the basis for understanding chemical bonding, the periodic table, and molecular geometry. Mastery of topics like Bohr’s model, dual nature of matter, and quantum numbers is essential for scoring high marks and developing a strong foundation for competitive exams like JEE and NEET.

This practice quiz is meticulously designed following the latest NCERT syllabus and CBSE 2024-25 exam pattern. It includes a variety of questions ranging from basic conceptual understanding of subatomic particles to complex numerical problems involving the Heisenberg Uncertainty Principle and Schrödinger wave equations. By solving these 30 high-quality MCQs, students can evaluate their preparation levels and gain clarity on the intricate details of electronic configurations and orbital shapes.

Minutes

Questions

1 / -0

Marking

Question Bank Preview

Q1. Which of the following statements about the electron is incorrect?

(A)

It is a negatively charged particle.

(B)

The mass of electron is equal to the mass of neutron.

(C)

It is a basic constituent of all atoms.

(D)

It is a constituent of cathode rays.

Q2. The number of protons, electrons and neutrons in $_ {35}^{80} \text{Br}$ are respectively:

(A)

35, 35, 45

(B)

45, 45, 35

(C)

35, 45, 35

(D)

45, 35, 35

Q3. Which of the following series of transitions in the spectrum of hydrogen atom falls in the visible region?

(A)

Lyman series

(B)

Balmer series

(C)

Paschen series

(D)

Brackett series

Q4. The energy of a photon is given by $E = \frac{hc}{\lambda}$ . If the wavelength $\lambda$ is doubled, the energy will:

(A)

Double

(B)

Remain same

(C)

Be halved

(D)

Become four times

Q5. What is the maximum number of electrons that can be accommodated in a shell with principal quantum number $n$ ?

(A)

$n^2$

(B)

$2n$

(C)

$2n^2$

(D)

$n+l$

Q6. The radius of the $n^{th}$ Bohr orbit for a hydrogen atom is given by:

(A)

$r_n = a_0 n^2$

(B)

$r_n = a_0 / n^2$

(C)

$r_n = a_0 n$

(D)

$r_n = a_0 / n$

Q7. Which quantum number defines the three-dimensional shape of the orbital?

(A)

Principal quantum number ( $n$ )

(B)

Azimuthal quantum number ( $l$ )

(C)

Magnetic quantum number ( $m_l$ )

(D)

Spin quantum number ( $m_s$ )

Q8. For $l = 2$ , the possible values of $m_l$ are:

(A)

0, 1, 2

(B)

-1, 0, +1

(C)

-2, -1, 0, +1, +2

(D)

1, 2, 3

Q9. The uncertainty in momentum of an electron is $1 \times 10^{-5}$ kg m/s. The uncertainty in its position ( $\Delta x$ ) will be: ( $h = 6.626 \times 10^{-34}$ J s)

(A)

$5.27 \times 10^{-30}$ m

(B)

$1.05 \times 10^{-29}$ m

(C)

$5.27 \times 10^{-28}$ m

(D)

$1.05 \times 10^{-31}$ m

Q10. Which of the following orbitals has two spherical (radial) nodes?

(A)

(B)

(C)

(D)

Q11. The de Broglie wavelength of a particle with mass $m$ and velocity $v$ is:

(A)

$\lambda = hv/m$

(B)

$\lambda = m/hv$

(C)

$\lambda = h/mv$

(D)

$\lambda = mv/h$

Q12. The electronic configuration of Chromium ( $Z=24$ ) is:

(A)

$[Ar] 3d^4 4s^2$

(B)

$[Ar] 3d^5 4s^1$

(C)

$[Ar] 3d^6 4s^0$

(D)

$[Ar] 4s^2 4p^4$

Q13. Which rule states that "No two electrons in an atom can have the same set of four quantum numbers"?

(A)

Hund's Rule

(B)

Aufbau Principle

(C)

Pauli Exclusion Principle

(D)

Heisenberg Principle

Q14. The total number of orbitals associated with the principal quantum number $n = 3$ is:

(A)

(B)

(C)

(D)

Q15. What is the energy of a photon of light with a frequency of $5 \times 10^{14}$ Hz?

(A)

$3.313 \times 10^{-19}$ J

(B)

$6.626 \times 10^{-19}$ J

(C)

$1.25 \times 10^{-18}$ J

(D)

$3.313 \times 10^{-20}$ J

...and 15 more challenging questions available in the interactive simulator.

More Quizzes for Class 11

Explore other chapters and subjects, or view all quizzes for this class.

JEE Practice Test

Motion in a plane (NCERT EXEMPLAR)

Quiz Tweek

Atomic Structure

Question Bank Preview

More Quizzes for Class 11

Chemistry

JEE

Maths

Physics