Daily Practice Problems Structure of Atom

Question1.

Why all the isotopes of a given element show same chemical behaviour?

Question2.

Wooden ball of 200 g does not move like a wave when it is thrown at a speed of 200 km/h. Calculate the wavelength of the wooden ball and explain why it does not show wave nature.

Question3.

Which of the following statement is incorrect according to Rutherford’s Nuclear model of atom?

(i) The positive charge and most of the mass of the atom was densely

concentrated in extremely small region. This very small portion of the atom

was called nucleus by Rutherford.

(ii) Electrons move in a circular path of fixed energy called orbits.

(iii) Electrons and the nucleus are held together by electrostatic forces of

attraction.

Question4.

The number of radial nodes for 4p orbital is __________.

(i) 3

(ii) 4

(iii) 2

(iv) 1

Question5.

Which of the following sets of quantum numbers are correct?

n l m_l

(i) 1 1 +2

(ii) 3 2 +2

(iii) 4 3 –3

(iv) 3 4 –2

Question6.

In case of which of the following orbitals, probability of finding the electron at a given distance is equal in all the directions?

1) s

2) d

3) p

4) none of the above orbitals

Question7.
Match the following

Subshell No. of Orbitals

s 7

d 3

g 1

p 11

f 5

h 9

Question8.

Calculate the wavelength of radiation in nanometer having frequency 5.89 × 10¹⁴ Hz. Which part of the electromagnetic spectrum does it belong to?

Question9.

Match the following species with their corresponding electronic configuration.

Atom / Ion Electronic configuration

(i) Cd (a) [Ar] 3d¹⁰

(ii) Cu⁺ (b) [Ar] 4s² 4p³

(iii) As (c) [Kr] 5s¹

(iv) Rb (d) [Kr] 4d¹⁰ 5s²

(e) [Ar] 3d⁹ 4s¹

Question10.

Which of the following orbitals are degenerate?

5d_xz, 4d_xy, 4d_yz, 5d_yz, 5d_xy

Question11.

In which of the following pairs, the ions are iso-electronic?

1) Al³⁺, N^3-

2) Mg³⁺, O^2-

3) F^-, Mg⁺

4) O^2-, Na⁺

Question12.

Show the distribution of electrons in Nitrogen atom using orbital diagram.

Question13.

The Balmer series in the hydrogen spectrum corresponds to the transition from n₁ = 2 to n₂ = 3,4,5, .......... This series lies in the visible region. Calculate the wave number of line associated with the transition in Balmer series when the electron moves to n = 5 orbit. (R_H = 109677 cm^–1)

Question14.

When a photon of frequency 1.0 × 10¹⁵ s^–1 was allowed to hit a metal surface, an electron having 1.988 × 10^–19 J of kinetic energy was emitted. Calculate the threshold frequency of this metal. Will electron be emitted if a photon with a wavelength equal to 400 nm hits the metal surface?

Question15.

Give the postulates on which Bohr’s model for Hydrogen atom is based.

Question16.

Thomson explained which of the following properties of atom correctly?

(i) Position of protons, electrons and neutrons in atom.

(ii) Spectra of H-atom.

(iii) Overall neutrality of atom.

(iv) Stability of atom.

Question17.

Match the following:

1) Magnetic quantum number a) shape of the orbital

2) Pauli Exclusion Principle b) Pairing of electrons in the orbitals

belonging to the same subshell does

not take place until each orbital is

singly occupied.

3) Azimuthal quantum number c) No two electrons in an atom can have

the same set of four quantum

numbers

4) Hund’s Rule d) It is impossible to determine the exact

position and exact momentum of a

electron simultaneously.

5) Heisenberg’s Uncertainty e) orientation of the orbital

Principle

Question18.

Which of the following statement/statements about the proton is/are correct?

(i) It is a positively charged particle.

(ii) The mass of proton is approximately equal to the mass of neutron.

(iii) It is a basic constituent of all atoms.

(iv) Canal rays in case of Hydrogen gas consisted of protons.

Question19.

Charge to mass ratio of electron determined by Thomson is equal to

1) 1.779 x 10¹¹ C kg^-1

2) 1.758 × 10^-11 C kg^–1

3) 1.779 x 10^-11 C kg^–1

4) 1.758 × 10¹¹ C kg^–1

Question20.

What is black body & black body radiation?

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All About Daily Practice Problems on Class 11 Chemistry Structure of Atom NCERT Chapter 2

Our Daily Practice Problems (DPPs) offer a diverse range of question types, including Multiple Choice Questions (MCQs) as well as short and long answer types. These questions are categorized into Easy, Moderate, and Difficult levels, allowing students to gradually progress and challenge themselves accordingly. Additionally, comprehensive solutions are provided for each question, available for download in PDF format - Download pdf solutions as well as Download pdf Questions. This approach fosters a holistic learning experience, catering to different learning styles, promoting self-assessment, and improving problem-solving skills. With our well-structured DPPs, students can excel in exams while gaining a deeper understanding of the subject matter. Hope you found the content on Class 11 Chemistry Structure of Atom NCERT Chapter 2 useful.

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