Which of the following scientists is known for the discovery of the proton? MCQ with Answer and Explanation

Which of the following scientists is known for the discovery of the proton?
A. J. J. Thomson
B. Ernest Rutherford
C. James Chadwick
D. Eugen Goldstein
Answer: Option B
Solution (By JKSSB Mock Tests)
Ernest Rutherford is generally credited with the discovery of the proton in 1919 through the nuclear reaction: ¹⁴N + α particle → ¹⁷O + proton. Eugen Goldstein earlier observed canal rays (positive rays) which were later identified as protons by Rutherford. Thomson discovered electron, Chadwick neutron. So Rutherford is the accepted discoverer.

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Practice More chemistry Questions

Question #1
Which of the following metals does NOT react with dilute acids to produce hydrogen?
A. Magnesium
B. Copper
C. Iron
D. Zinc

Correct Answer: Option B


Explanation:
Copper is below hydrogen in the reactivity series, so it cannot displace hydrogen from dilute acids (non-oxidizing acids like HCl or H₂SO₄). Magnesium, zinc, and iron are above hydrogen and react to produce H₂ gas. However, copper reacts with oxidizing acids like HNO₃ and hot conc. H₂SO₄, but not to produce H₂—they produce NO₂/SO₂.

This question belongs to: Science chemistry
Question #2
Which gas is known as 'marsh gas'?
A. Methane
B. Butane
C. Propane
D. Ethane

Correct Answer: Option A


Explanation:
Methane (CH4) is commonly known as marsh gas because it is produced by the anaerobic decomposition of organic matter in swamps and marshes by methanogenic bacteria. It is also the primary component of biogas and natural gas.

This question belongs to: Science chemistry
Question #3
Which of the following is used as a solvent?
A. Ethanol
B. Ethanoic acid
C. All of the above
D. Ethyl ethanoate

Correct Answer: Option C


Explanation:
Ethanol is a versatile solvent used in medicines like tinctures and perfumes. Ethanoic acid (glacial) can act as a solvent for many organic compounds. Ethyl ethanoate is an excellent solvent for fats, resins, and plastics, often used in nail polish removers and industrial paints.

This question belongs to: Science chemistry