The modern concept of the chemical bond via shared pairs of electrons (covalent bond) was discovered by whom? MCQ with Answer and Explanation

Question
The modern concept of the chemical bond via shared pairs of electrons (covalent bond) was discovered by whom?
A. Linus Pauling
B. John Dalton
C. Gilbert N. Lewis
D. Svante Arrhenius
Answer: Option C
Solution (By JKSSB Mock Tests)
Gilbert N. Lewis introduced electron-dot structures and developed the electronic theory of chemical bonding in 1916.
This question belongs to: Static General Knowledge Inventions and Discoveries
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Question #1
Who discovered the bacterium Vibrio cholerae, the causative agent of cholera?
A. Louis Pasteur
B. Joseph Lister
C. Alexander Fleming
D. Robert Koch
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Correct Answer: Option D

Explanation:
Robert Koch isolated Vibrio cholerae in 1883 during an epidemic outbreak investigation in Egypt and India.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #2
Who discovered that the atomic mass of elements can vary within the same identity due to changing neutron levels, establishing 'Isotopes'?
A. James Chadwick
B. Ernest Rutherford
C. Frederick Soddy
D. J.J. Thomson
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Correct Answer: Option C

Explanation:
Soddy introduced the concept of isotopes in 1913, proving that elements can have identical chemical behaviors but different radioactive profiles.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #3
Who invented the first operational stethoscope in 1816?
A. Louis Pasteur
B. Joseph Lister
C. Edward Jenner
D. René Laennec
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Correct Answer: Option D

Explanation:
René Laennec invented the acoustic stethoscope because he felt uncomfortable placing his ear directly on female patients' chests.
This question belongs to: Static General Knowledge Inventions and Discoveries
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