1 previous year UPSC Prelims question on Chemistry: Physical Chemistry (Science and Technology). Choose an option to see the answer and explanation.
Explanations state facts as of the year each question was asked; words like “recently” refer to that year.
Showing 1–1 of 1 question
An alpha particle consists of two protons and two neutrons, which is exactly the nucleus of a helium atom (He2+). The mass of an alpha particle is very close to the mass of a helium atom as the mass of electrons is insignificant in comparison with protons and neutrons.
| Q | UPSC year | Correct answer |
|---|---|---|
| 1 | 1996 | (b) an atom of helium |
This page covers 1 previous year UPSC Prelims GS Paper-I questions on Chemistry: Physical Chemistry (Science and Technology), asked from 1996 to 2009. Each has the correct answer and an explanation.
Attempt each question first, then open the answer and read the explanation for every option. Repeat by chapter, and track which statements UPSC reuses across years. Previous year questions show the exam pattern and difficulty level.
Questions on Chemistry: Physical Chemistry (Science and Technology) are available for 8 years, from 1996 to 2009. Use the Year filter to practise a single paper.
