Who discovered the law of gas volume variations under changing pressures, known as the first gas law? MCQ with Answer and Explanation

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Who discovered the law of gas volume variations under changing pressures, known as the first gas law?

A. Amadeo Avogadro

B. Joseph Louis Gay-Lussac

C. Jacques Charles

D. Robert Boyle

Answer: Option D

Solution (By JKSSB Mock Tests)

Robert Boyle published Boyle's Law in 1662, establishing that pressure and volume of a gas are inversely proportional at constant temperature.

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Who discovered that the chemical element Iodine is isolated from seaweed ash matrices?

A. Antoine Lavoisier

B. Bernard Courtois

C. Joseph Louis Gay-Lussac

D. Humphry Davy

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Correct Answer: Option B

Explanation:
Bernard Courtois isolated violet iodine vapors accidentally in 1811 while adding excess sulfuric acid to seaweed extract solutions.

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Question #2

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Who discovered that electric fields can split light spectral lines, a physical phenomenon known as the Stark Effect?

A. Johannes Stark

B. Hendrik Lorentz

C. Max Planck

D. Pieter Zeeman

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Correct Answer: Option A

Explanation:
Johannes Stark discovered the electric splitting of hydrogen spectral lines in 1913, winning the 1919 Nobel Prize in Physics.

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Question #3

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Who discovered that the chemical element Magnesium is isolated as a distinct metal element via mercury amalgamation?

A. Carl Wilhelm Scheele

B. Antoine Lavoisier

C. Joseph Black

D. Humphry Davy

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Correct Answer: Option D

Explanation:
Black identified magnesium compounds early, but Sir Humphry Davy isolated pure metallic magnesium via electrochemical processing in 1808.

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