J.J. Thomson is credited with the discovery of the: MCQ with Answer and Explanation

J.J. Thomson is credited with the discovery of the:
A. Proton
B. Neutron
C. Nucleus
D. Electron
Answer: Option D
Solution (By JKSSB Mock Tests)
J.J. Thomson discovered the electron in 1897 through his experiments with cathode ray tubes. He demonstrated that cathode rays were composed of previously unknown negatively charged particles, which were later named electrons. This discovery proved that atoms were not indivisible and led to his 'plum pudding' model.

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Practice More chemistry Questions

Question #1
Washing soda is:
A. NaHCO₃
B. NaOH
C. CaOCl₂
D. Na₂CO₃·10H₂O

Correct Answer: Option D


Explanation:
Washing soda is sodium carbonate decahydrate (Na₂CO₃·10H₂O). Baking soda is NaHCO₃. Caustic soda is NaOH. Bleaching powder is CaOCl₂.

This question belongs to: Science chemistry
Question #2
Which of the following salts is used in the manufacture of glass?
A. Sodium carbonate
B. Sodium chloride
C. Potassium nitrate
D. Ammonium chloride

Correct Answer: Option A


Explanation:
Sodium carbonate (Na₂CO₃), also called soda ash, is a key ingredient in glass manufacturing. It lowers the melting point of silica (SiO₂) and provides sodium oxide. The glass batch consists of sand (SiO₂), soda ash (Na₂CO₃), and limestone (CaCO₃). Sodium chloride is table salt, potassium nitrate used in gunpowder, ammonium chloride in batteries/leclanche cells.

This question belongs to: Science chemistry
Question #3
The concept of half-life applies to:
A. Zero-order reactions only
B. First-order reactions only
C. Only chemical reactions
D. All radioactive decay

Correct Answer: Option D


Explanation:
Half-life is a characteristic of first-order kinetics, and all radioactive decay follows first-order kinetics. Hence it applies to all radioactive decay processes. Chemical reactions of first order also have constant half-life independent of initial concentration, but radioactive decay is the prime example. Zero-order half-life depends on initial concentration.

This question belongs to: Science chemistry