set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

The isoneutronic group, in the following is

a) $^{6}C_{12}, ^{7}N_{14}, ^8N_{18}$

b) $^6C_{14}, ^7N_{14}, ^8O_{16}$

c) $^6C_{12}, ^7N_{14}, ^8O_{16}$

d) $^6C_{14}, ^7N_{15}, ^8O_{16}$

Question : 2

The atomic number of an element is 11 and its mass number is 23. The correct order representing the number of electrons, protons and neutrons respectively in this atom is

a) 11, 12, 11

b) 12, 11, 11

c) 11, 11, 12

d) 23, 11, 23.

Question : 3

The Nucleus of Helium has

a) Two protons

b) Two protons and two neutrons

c) Only one neutron

d) One proton and two neutrons

Question : 4

Which is the symbol of the element tungsten?

a) W

b) Tc

c) Ta

d) V

Question : 5

When an atom loses electrons, it is called a (an) _____ and has a ______ charge.

a) cation, positive

b) anion, negative

c) anion, positive

d) cation, positive

Question : 6

Age of fossil may be found out by determining the ratio of two isotopes of carbon. The isotopes are

a) C-12 and C-14

b) C-13 and C-14

c) C-12 and C-13

d) C-12 and carbon black