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Chemistry - Atomic Structure: Prepare and Practice for Medical, Engineering Entrance Exams, NEET, IITJEE, NAT, IIST-ISAT and Admission Tests | Online Free Preparation


Chemistry MCQ Practice Questions on Atomic Structure / Structure of Atoms :
Sub-atomic Particles; Discovery of Fundamental Particles; Cathode Rays; Positive Rays; Rutherford Model; Moseley Experiment - Atomic Number; Isotopes and Isobars; Concept of Shells and Sub-shells; Electromagnetic Radiations; Emission Spectra; Hydrogen Spectrum; Atomic Models; Bohr’s Model of Atom; Sommerfeld’s Extension of Bohr Theory; Dual Nature of Matter and Light; Heisenberg Uncertainty Principle; Wave Mechanical Model of Atom; Concept of Orbital; Quantum Mechanical Model of Atom; Shapes of s, p and d Orbitals; Pauli’s Exclusion Principle; Aufbau Principlr; Hund’s Rule of Maximum Multiplicity (Orbital Diagrams); Electronic Configuration of Elements; Photoelectric Effect; Nuclear Stability; The Whole Number Rule and Packing Fraction; The Magic Numbers.       

Solved Chemistry MCQ Test Series: Atomic Structure or Structure of Atom
Multiple Choice Questions (MCQs) – Set 2 (Q. No. 11-20)

Question 11: Atomic number of an electron represents:
a. Number of neutrons in the nucleus
b. Atomic mass of an element
c. Valency of an element
d. Number of protons in the nucleus

Question 12: Radius of Bohr’s orbit of hydrogen atom is –
a. 0.24 Å
b. 0.48 Å
c. 0.53 Å
d. 1.06 Å

Question 13: Rutherford’s alpha ray scattering experiment showed for the first time that the atom has –
a. Nucleus
b. Proton
c. Electron
d. Neutron

Question 14: Principal quantum number of an atom represents
a. Size of the orbital
b. Spin angular momentum
c. Orbital angular momentum
d. Space orientation of the orbital 

Question 15: The number of unpaired electrons in magnesium atom is –
a. 0
b. 1
c. 2
d. 3

Question 16: How many photons of light having a wavelength of 5000 Å are necessary to provide 1 joule of energy?
a. 2.8 x 1018 photons
b. 2.5 x 1017 photons
c. 2.5 x 1018 photons
d. 2.6 x 1014 photons

Question 17: When alpha particles are sent through a thin metal foil, most of them go straight through the foil because
a. Alpha particles are much heavier than electrons
b. Alpha particles are positively charged
c. Most part of the atom is empty
d. Alpha particles move with high velocity

Question 18: Discovery of the nucleus of an atom was due to the experiment carried out by:
a. Bohr
b. Rutherford
c. Moseley
d. Thomson

Question 19: The species which has its fifth ionisation potential equal to 340 V is –
a. B+
b. C+
c. B
d. C

Question 20: The energy of a photon is inversely proportional to its –
a. Wavelength
b. Frequency
c. Wave number
d. Velocity

 India Study Solution - Solved Chemistry MCQ Test Series
Atomic Structure (Structure of Atom)
Solutions of Multiple Choice Questions (MCQ Test Series) – Set 2 (Q. No. 11 – 20)

Answer 11: (d).   Answer 12: (c).   Answer 13: (a).   Answer 14: (a).   Answer 15: (a).   Answer 16: (c).   Answer 17: (c).   Answer 18: (c).   Answer 19: (c).   Answer 20: (a).

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