Who discovered that the chemical element Chromium is isolated from Siberian red lead ore matrices? MCQ with Answer and Explanation

Question
Who discovered that the chemical element Chromium is isolated from Siberian red lead ore matrices?
A. Martin Heinrich Klaproth
B. Louis-Nicolas Vauquelin
C. Carl Wilhelm Scheele
D. Antoine Lavoisier
Answer: Option B
Solution (By JKSSB Mock Tests)
Vauquelin isolated chromium in 1797 by treating crocoite mineral crystals with hydrochloric acid compounds.
This question belongs to: Static General Knowledge Inventions and Discoveries
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Question #1
Who invented the first mechanical computer, known as the 'Difference Engine'?
A. Blaise Pascal
B. John von Neumann
C. Charles Babbage
D. Alan Turing
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Correct Answer: Option C

Explanation:
Charles Babbage designed the Difference Engine and the Analytical Engine, earning him the title 'Father of the Computer'.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #2
Who discovered artificial radioactivity and shared a Nobel Prize with her husband in 1935?
A. Irène Joliot-Curie
B. Marie Curie
C. Lise Meitner
D. Maria Goeppert Mayer
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Correct Answer: Option A

Explanation:
Irène Joliot-Curie (daughter of Marie Curie) and her husband Frédéric Joliot-Curie discovered artificial radioactivity.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #3
Who discovered the first known antibiotic substance produced by soil actinomycetes, Actinomycin?
A. Robert Koch
B. Selman Waksman
C. Alexander Fleming
D. Louis Pasteur
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Correct Answer: Option B

Explanation:
Selman Waksman and his student H. Boyd Woodruff isolated actinomycin in 1940, sparking targeted soil microbe screening programs.
This question belongs to: Static General Knowledge Inventions and Discoveries
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