PrepBharat

1. The number of nodal planes ‘d’ orbital has
a) 1
b) 2
c) 3
d) 0

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2. What do you mean by degenerate orbitals?
a) Orbitals having equal energy
b) Oribitals having equal wave function
c) Oribitals having equal energy but different wave function
d) Orbitals having equal energy and equal wave function

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3. The number of nodal planes in a \[p_{X}\] orbital is
a) one
b) two
c) three
d) zero

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4. A 5f orbital has
a) one node
b) two nodes
c) three nodes
d) four nodes

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5. “ No two electrons in an atom can have same set of all the four quantum numbers” is known as
a) Hund’s rule
b) Aufbau principle
c) Uncertainty principle
d) Pauli’s exclusion principle

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6. Which of the following has maximum number of unpaired electrons
a) \[Mg^{2+}\]
b) \[Ti^{3+}\]
c) \[V^{3+}\]
d) \[Fe^{2+}\]

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Answer: d
Explanation:

7. An element M has an atomic mass 19 and atomic number 9, its ion is represented by
a) \[M^{+}\]
b) \[M^{2+}\]
c) \[M^{-}\]
d) \[M^{2-}\]

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8. The configuration \[1s^{2}2s^{2}2p^{5}3 s^{1}\]   shows
a) ground state of fluorine
b) excited state of fluorine
c) excited state of neon atom
d) excited state of \[O_2^-\] ion

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9. Heisenberg's Uncertainity principle is applicable to
a) atoms only
b) electron only
c) nucleus only
d) any moving object

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10. Electronic configuration of four elements are given below. Which of the corresponding element would be most paramagetic?
a) \[1s^{2}2s^{2}2p^{6}\]
b) \[1s^{2}2s^{2}2p^{1}\]
c) \[1s^{2}2s^{2}2p^{5}\]
d) \[1s^{2}2s^{2}2p^{4}\]

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