Who discovered Hydrogen gas, which he called 'inflammable air'? MCQ with Answer and Explanation

Question
Who discovered Hydrogen gas, which he called 'inflammable air'?
A. Joseph Priestley
B. John Dalton
C. Antoine Lavoisier
D. Henry Cavendish
Answer: Option D
Solution (By JKSSB Mock Tests)
Henry Cavendish isolated hydrogen gas in 1766 and recognized it as a discrete substance.
This question belongs to: Static General Knowledge Inventions and Discoveries
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Question #1
Who discovered that elements display periodic physical attributes when arranged strictly by atomic weight values?
A. Henry Moseley
B. Antoine Lavoisier
C. Dmitri Mendeleev and Julius Lothar Meyer
D. John Dalton
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Correct Answer: Option C

Explanation:
Mendeleev and Meyer independently formulated structural periodic tables, but Mendeleev gained fame by accurately predicting undiscovered elements.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #2
The invention of the common household refrigeration fluid known as Freon (CFC) was developed by which chemist?
A. Wallace Carothers
B. Leo Baekeland
C. Thomas Midgley Jr.
D. Roy Plunkett
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Correct Answer: Option C

Explanation:
Midgley synthesized dichlorodifluoromethane at General Motors in 1928, creating non-toxic, non-flammable cooling gases that later had severe environmental impacts.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #3
The invention of the electronic compiler, which translates high-level source code into computer machine language, was achieved by whom?
A. Alan Turing
B. John von Neumann
C. Charles Babbage
D. Grace Hopper
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Correct Answer: Option D

Explanation:
Rear Admiral Grace Hopper created the A-0 compiler in 1951 and was instrumental in developing the COBOL language.
This question belongs to: Static General Knowledge Inventions and Discoveries
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