Chemistry Chapter 2 Entry Test MCQs
126. Which statement about copper is incorrect
a. the electronic configuration of copper atoms is 1s22s22p63s23p64s13d10
b. the electronic configuration of Cu+ is 1s22s22p63s23p63d10
c. the electronic configuration of copper atoms is 1s22s22p63s23p64s23d9
d. the electronic configuration of Cu2+ is 1s22s22p63s23p63d9
127. A neutral atom of an element has 2 electrons in the first energy level, 8 in the second energy level and 8 in the third energy level. This information does not necessarily tell us:
a. the total number of electrons in p orbitals
b. the atomic number of the element
c. the number of neutrons in the nucleus of an atom of the element
d. the total number of electrons in s orbitals.
128. Which of the following helps to predict valency of element?
a. Hund’s rule
b. Pauli’s Principle
c. Aufbau Principle
d. Sidgewick rule
129. Which species has same number of electrons in valence shell and penultimate (second last) shell
a. Al+3
b. a+
c. Cl–
d. Cl–
Miscellaneous
130. Total number of fundamental particles in one atom of 14/6 C is
a. 8
b. 6
c. 20
d. 14
131. Which of the following specie has more electrons than neutrons?
a. O-1
b. Na+
c. Mg+2
d. F-1
132. Total number of valence electrons in phosphonium PH4+ ion is
a. 8
b. 16
c. 18
d. 32
133. Which of the following formulae represents a particle with the composition 1 proton, 1 neutron and 2 electrons? (D represents deuterium, ²𝑯)
a. 𝐷−
b. D
c. He
d. 𝐻−
134. Which of the following species has fundamental particles in order e > n > p
a. O2-
b. N3-
c. P3-
d. Cl1-
135. The total number of electrons, protons and neutrons in azide ion (N31-) are:
a. 22, 22, 22
b. 22, 21, 21
c. 21, 22, 21
d. 21, 21, 21
136. The electronic configuration of metal ion M+2 is 2, 8, 14 and its atomic mass is 56. The number of neutrons in its nucleus is
a. 34
b. 30
c. 42
d. 32
137. Atoms of the elements N and P have:
a. the same number of electrons
b. the same number of protons
c. the same number of neutrons
d. the same number of valence electrons