136. In a given atom no two electrons can have the same values for all the four quantum numbers. This is called
a) Hund’s rule b) Aufbau’s principlec) Uncertainty principle d) Pauli’s exclusion principle.
138. Electronic configuration of H- is
a) 1s0 b) 1s1c) 1s2 d) 1s12s1
140. The following has zero valency
a) Sodium b) Beryllium c) Aluminium d) Krypton
142. The explanation for the presence of three unpaired electrons in the nitrogen atom can be given by
a) Pauli’s exclusion principle b) Hund’s rule
c) Aufbau’s principle d) Uncertainty principle
146. For p - orbital, the magnetic quantum number has value
a) 2 b) 4, - 4 c) -1, 0, + 1 d) 0
147. Number of unpaired electrons in Mn4+ is
a) 3 b) 5 c) 6 d) 4
148. When 3d orbital is complete, the new electron will enter the
a) 4p - orbital b) 4f - orbital c) 4s - orbital d) 4d - orbital
149. The orbital with maximum energy is
a) 3d b) 5p c) 4s d) 6d
150. The correct order of increasing energy of atomic orbitals is
a) 5p < 4f < 6s < 5d b) 5p < 6s < 4f < 5d c) 4f < 5p < 5d < 6s d) 5p < 5d < 4f < 6s
151. The atomic orbirtals are progressively filled in order of increasing energy. This principle is called as
a) Hund’s rule b) Aufbau principle c) Exclusion principle d) de - Broglie rule
Answers
Answer:
In a given atom no two electrons can have the same values for all the four quantum numbers. This is called d) Pauli’s exclusion principle.
Electronic configuration of H- is b) 1s1
The following has zero valency (D) Krypton.
The explanation for the presence of three unpaired electrons in the nitrogen atom can be given by b) Hund’s rule
For p - orbital, the magnetic quantum number has value c) -1, 0, + 1
Number of unpaired electrons in Mn4+ is a) 3
When 3d orbital is complete, the new electron will enter the a) 4p - orbital
The orbital with maximum energy is d) 6d
The correct order of increasing energy of atomic orbitals is b) 5p < 6s < 4f < 5d
The atomic orbirtals are progressively filled in order of increasing energy. This principle is called as b) Aufbau principle