MCQs for Chemistry Paper: Here are some UPSC Chemistry exam questions and answers for candidates’ reference by UPSC Pathfinder of Pioneer Academy. This question bank includes sample questions so that candidates can become familiar with the format of the test and the topics they should concentrate on learning for the exam.

1. Which of the following is a physical change?

(a) Rusting of iron
(b) Combustion of magnesium ribbon
(c) Burning of candle
(d) Melting of wax

ans : (d)

2. Which of the following gas is radioactive?

(a) Ne
(b) Rn
(c) He
(d) Xe

ans : (b)

3. In the presence of a catalyst the heat evolved or absorbed during chemical reaction

(a) decreases
(b) increases
(c) remains same
(d) may increase or decrease

ans : (c)

4. Arrange the following in order of their increasing thermal conductivity

(a) Al, Ag, Cu
(b) Cu, Ag, Al
(c) Ag, Cu, Al
(d) Al, Cu, Ag

ans : (c)

5. The third allotropic form of carbon is

(a) Lead
(b) Fullerenes
(c) Camphor
(d) Diamond

ans : (b)

6. The solution which resists the change on dilution or with small addition of acid or base is called

(a) Normal solution
(b) Buffer solution
(c) Acidic solution
(d) Basic solution

ans : (b)

7. Which of the following polymers is used in paints?

(a) Terylene
(b) Nylon
(c) Glyptal
(d) Chloroprene

ans : (c)

8. The process of extracting different fractions from petroleum products by heating is known as

(a) Refining
(b) Plating
(c) Condensation
(d) Evaporation

ans : (a)

9. The age of plants can be determined by the process of

(a) Carbon dating
(b) Fussion
(c) Isotopes
(d) Isobars

ans : (a)

10. Which one of the following statements regarding a catalyst is not correct?

(a) An enzyme is a catalyst that only binds certain substances.
(b) An enzyme is a protein that is a highly efficient catalyst for one or more chemical reactions in a living system.
(c) Catalyst increase the rate of a reaction by altering the mechanism, thereby increasing the activation energy.
(d) Catalysts do not alter the equilibrium constant for a chemical reaction.

ans : (c)