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

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The modern concept of the chemical bond via shared pairs of electrons (covalent bond) was discovered by whom?

A. Gilbert N. Lewis

B. John Dalton

C. Linus Pauling

D. Svante Arrhenius

Answer: Option A

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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The invention of the common household cooking device known as the Microwave Oven was an accidental discovery by whom?

A. Thomas Edison

B. Theodore Maiman

C. Robert Watson-Watt

D. Percy Spencer

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Correct Answer: Option D

Explanation:
Spencer noticed a candy bar melted in his pocket in 1945 while standing near an active military radar magnetron vacuum tube.

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Question #2

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The invention of the mass spectrometer, used to separate isotopes and determine chemical composition, was developed by whom?

A. Francis William Aston

B. James Chadwick

C. Ernest Rutherford

D. J.J. Thomson

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Correct Answer: Option A

Explanation:
Francis William Aston built the first fully functional mass spectrograph in 1919 and discovered isotopes in non-radioactive elements.

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Question #3

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Who discovered the specific mathematical formula detailing gas density variation relative to molecular weight, known as the diffusion law?

A. Robert Boyle

B. Thomas Graham

C. Amadeo Avogadro

D. John Dalton

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Correct Answer: Option B

Explanation:
Graham's Law states that the rate of effusion or diffusion of a gas is inversely proportional to the square root of its molecular mass.

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