PrepBharat

1. Ground state electronic configuration of valence shell electrons in nitrogen molecule (N₂) is written as \[\left(\sigma_{2s}\right)^{2}\left(\sigma*_{2s}\right)^{2}\left(\pi_{2p}\right)^{4}\left(\sigma_{2p}\right)^{2}\]     Hence the bond order of nitrogen molecule is
a) 2
b) 3
c) 0
d) 1

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2. The bond order of NO molecule is
a) 1.5
b) 2.0
c) 2.5
d) 3.0

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3. Which of the following cannot be formed ?
a) \[He^{2+}\]
b) \[He^{+}\]
c) He
d) \[He_{2}\]

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4. \[N_{2}\] and \[N_{2}\] are converted into monoanions, \[N_2^-\]and \[O_2^-\] respectively. Which of the following statements is wrong ?
a) In \[N_2^-\] , N – N bond weakens
b) In \[O_2^-\] , O - O bond order increases
c) In \[O_2^-\] , O - O bond order decreases
d) \[N_2^-\] becomes paramagnetic

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5. \[N_{2}\] and \[N_{2}\] are converted into monocations, \[N_2^+\] and \[O_2^+\] respectively. Which of the following statements is wrong?
a) In \[N_2^+\] , N - N bond weakens
b) In \[O_2^+\] , the O - O bond order increases
c) In \[O_2^+\] , paramagnetism decreases
d) \[N_2^+\] becomes diamagnetic

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6. Which of the following molecule is paramagnetic?
a) \[CO_{2}\]
b) \[SO_{2}\]
c) NO
d) \[H_{2}O\]

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7. In \[PO_4^{3-}\] , the formal charge on each oxygen atom and the P - O bond order respectively are
a) –0.75, 0.6
b) –0.75, 1.0
c) –0.75, 1.25
d) –3, 1.25

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8. Which of the following ion has not bond order of 2.5 ?
a) \[O_2^-\]
b) \[O_2^+\]
c) \[N_2^+\]
d) \[N_2^-\]

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9. Oxygen molecule is
a) diamagnetic with no unpaired electrons
b) diamagnetic with two unpaired electrons
c) paramagnetic with two unpaired electrons
d) paramagnetic with no unpaired electrons

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10. The number of electrons that are paired in oxygen molecule
a) 16
b) 12
c) 7
d) 8

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