PrepBharat

1. Which of the following is the electronic configuration of \[Cu^{2+}\left(Z=29\right)\]  ?
a) \[\left[Ar\right]4s^{1}3d^{8}\]
b) \[\left[Ar\right]4s^{2}3d^{10}4p^{1}\]
c) \[\left[Ar\right]4s^{1}3d^{10}\]
d) \[\left[Ar\right]3d^{9}\]

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2. Which of the following explains the sequence of filling electrons in different shells ?
a) Hund’s rule
b) Octet rule
c) Aufbau principle
d) All of these

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3. Which of the following has more unpaired d-electrons?
a) \[Zn^{+}\]
b) \[Fe^{2+}\]
c) \[Ni^{3+}\]
d) \[Cu^{+}\]

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4. Which of the following configurations is correct for iron?
a) \[1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{5}\]
b) \[1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{5}\]
c) \[1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{7}\]
d) \[1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{6}\]

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5. The maximum number of electrons that can be accomodated in d-sub-shell is
a) 10
b) 8
c) 6
d) 4

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6. The number of unpaired electrons in an atom of atomic number 24 (in ground state) is
a) 3
b) 4
c) 5
d) 6

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7. The number of unpaired electrons in a Nickel atom (ground state) are (Atomic No. of Ni = 28)
a) 2
b) 5
c) 3
d) 7

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8. The element with its electronic configuration of its atom \[1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{1}\]     is
a) Fe
b) Co
c) Ni
d) Cu

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9. In Cu. (At. No. 29)
a) 13 electrons have spin in one direction and 16 electrons in other direction
b) 14 electrons have spin one direction and 15 electrons in other direction
c) one electron can have spin only in the clockwise direction
d) None of the above is correct

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10. Which of the following atom has no neutron in its nucleus?
a) Helium
b) Lithium
c) Protium
d) Tritium

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