Niels Bohr's model of the atom introduced the concept of: MCQ with Answer and Explanation

Question
Niels Bohr's model of the atom introduced the concept of:
A. Wave-particle duality of electrons.
B. Electrons embedded in a positive sphere.
C. Quantized electron orbits.
D. A dense central nucleus.
Answer: Option C
Solution (By JKExamLibrary)
In 1913, Niels Bohr modified Rutherford's model to explain atomic stability and emission spectra. He introduced the concept of quantized electron orbits (or energy levels), stating that electrons revolve in specific, fixed orbits without radiating energy, and they only emit or absorb energy when jumping between these discrete levels.
This question belongs to: Science chemistry

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Practice More chemistry Questions

Question #1
Hydrogen peroxide decomposes slowly on exposure to light. To prevent this, it is stored in:
A. Open beakers
B. Metal containers
C. Clear glass bottles
D. Dark colored bottles
Discuss

Correct Answer: Option D

Explanation:
Light catalyzes decomposition of H₂O₂. Dark bottles (amber) block light, stabilizing it. Often a stabilizer like urea or phosphoric acid is added. Metal containers may catalyze decomposition.
This question belongs to: Science chemistry
Question #2
Which of the following represents a chemical change?
A. Melting of ice
B. Dissolving sugar in water
C. Sublimation of iodine
D. Rusting of iron
Discuss

Correct Answer: Option D

Explanation:
Rusting is a chemical change because iron reacts with atmospheric oxygen and moisture to form hydrated iron(III) oxide. This new compound possesses entirely different chemical properties from the original iron. The process involves the formation of new chemical bonds and cannot be easily reversed by simple physical methods.
This question belongs to: Science chemistry
Question #3
Which element has the highest electronegativity?
A. Chlorine
B. Nitrogen
C. Oxygen
D. Fluorine
Discuss

Correct Answer: Option D

Explanation:
Fluorine is the most electronegative element with a Pauling electronegativity of 3.98. Electronegativity increases across a period and decreases down a group. Thus, among the halogens, F > Cl > Br > I. Oxygen (3.44) is second. Electronegativity determines bond polarity. Because of its small size and high effective nuclear charge, fluorine strongly attracts bonding electrons. Noble gases are not assigned electronegativity values (except Kr, Xe).
This question belongs to: Science chemistry
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