atomic structure molecules and nuclear chemistry - Category wise Question and Answer Practice Test with Solutions

Question : 16

The number of molecules in one mole of a gas is

a) 6.023 × 10²¹

b) 6.023 × 10²²

c) 6.023 × 10²³

d) 6.023 × 10²⁰

Question : 17

Which of the following have equal number of neutrons and protons?

a) Deuterium

b) Fluorine

c) Hydrogen

d) Chlorine

Question : 18

Adding electrons to an atom will result in a (an)

a) anion

b) cation

c) molecule

d) salt

Question : 19

Which of the following statements is incorrect for cathode rays?

a) Their nature depends upon the nature of gas present in the discharge tube.

b) They cost shadow of solid objects placed in their path

c) They move in straight line

d) They get deflected towards positive charge.

Question : 20 [NDA]

An atom of carbon has 6 protons. Its mass number is 12. How many neutrons are present in an atom of carbon?

a) 10

b) 6

c) 12

d) 14