Who discovered that the chemical element Boron is isolated by reacting boric acid with potassium metal? MCQ with Answer and Explanation

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Who discovered that the chemical element Boron is isolated by reacting boric acid with potassium metal?

A. Jöns Jacob Berzelius

B. Joseph Louis Gay-Lussac and Louis Jacques Thénard

C. Antoine Lavoisier

D. Humphry Davy

Answer: Option B

Solution (By JKSSB Mock Tests)

Gay-Lussac and Thénard independently isolated elemental boron in 1808, around the same time as Sir Humphry Davy.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Who discovered that elements display unique crystalline patterns when rapidly frozen from molten metal matrices, founding physical Metallurgy?

A. Henry Clifton Sorby

B. Antoine Lavoisier

C. Henry Bessemer

D. Dmitri Mendeleev

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Correct Answer: Option A

Explanation:
Sorby applied microscopic analysis to polished iron and steel samples, establishing microstructure phase boundaries.

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Question #2

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The first practical mechanical sewing machine was patented by whom in 1846?

A. Eli Whitney

B. Walter Hunt

C. Isaac Singer

D. Elias Howe

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Correct Answer: Option D

Explanation:
Elias Howe patented the first practical lockstitch sewing machine in the United States in 1846.

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Question #3

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The invention of the highly reflective silver glass surface mirror layout was developed by which chemist?

A. Justus von Liebig

B. Robert Bunsen

C. Carl Wilhelm Scheele

D. Antoine Lavoisier

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Correct Answer: Option A

Explanation:
Liebig developed the chemical process of depositing thin metallic silver onto glass panes using chemical reduction reactions in 1835.

This question belongs to: Static General Knowledge Inventions and Discoveries

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