TNPSC Chemistry MCQ Questions and Answers - 2

Question: 6

Isotopes differ in the number of

(A) Electrons

(B) Protons

(C) Neutrons

(D) Protons and electrons

Question: 7

At what temperature does the water has maximum density?

(A) 2°C

(B) 4°C

(C) 6°C

(D) 8°C

Question: 8

Which of the following is not a chemical reaction?

(A) Burning of coal

(B) Burning of paper

(C) Digestion of food

(D) Conversion of water into steam

Question: 9

Galena is an ore of the metal

(A) Silver

(B) Aluminium

(C) Mercury

(D) Lead

Question: 10

Helium is preferred to hydrogen in air balloons because it

(A) is cheaper

(B) is less dense

(C) has greater lifting power

(D) does not form an explosive mixture with air