The invention of the common chemical element symbol notation system ($H, O, Ca$) used today was developed by whom? MCQ with Answer and Explanation

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The invention of the common chemical element symbol notation system ($H, O, Ca$) used today was developed by whom?

A. Dmitri Mendeleev

B. Antoine Lavoisier

C. John Dalton

D. Jöns Jacob Berzelius

Answer: Option D

Solution (By JKSSB Mock Tests)

Berzelius introduced letter symbols based on Latin element names in 1813, replacing Dalton's cumbersome symbolic diagrams.

This question belongs to: Static General Knowledge Inventions and Discoveries

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The invention of the common mechanical office typewriter correction fluid ('Liquid Paper') was developed by which female innovator?

A. Grace Hopper

B. Mary Anderson

C. Josephine Cochrane

D. Bette Nesmith Graham

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Correct Answer: Option D

Explanation:
Graham mixed white tempera paint in a blender in the 1950s to fix her typing errors, later scaling the multi-million-dollar Liquid Paper company.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #2

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Who discovered that stable elements possess unique integer identifiers based on X-ray emission frequencies, restructuring atomic numbers?

A. Dmitri Mendeleev

B. J.J. Thomson

C. Ernest Rutherford

D. Henry Moseley

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Correct Answer: Option D

Explanation:
Moseley proved that ordering chemical elements by nuclear charge (atomic number) resolved inconsistencies in Mendeleev's mass-ordered layout.

This question belongs to: Static General Knowledge Inventions and Discoveries