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प्रश्न
Which of the following options represents the correct bond order?
पर्याय
\[\ce{O^{-}2 > O2 > O^{+}2}\]
\[\ce{O^{-}2 < O2 < O^{+}2}\]
\[\ce{O^{-}2 > O2 < O^{+}2}\]
\[\ce{O^{-}2 < O2 > O^{+}2}\]
उत्तर
\[\ce{O^{-}2 < O2 < O^{+}2}\]
Explanation:
The electronic configurations and the bond orders of the given species are given below:
Bond order of \[\ce{O^{-}2}\]:
Electronic configuration:
`σ1s^2, σ^∗1s^2, σ2s^2, σ^∗2s^2, σ2p_z^2 (π2p_x^2 = 2p_y^2)(π^∗2p_x^1 = π^∗2p_y^1)`
Bond order = `1/2 (N_b - N_a)`
BO = `1/2(10 - 7) = 3/2 = 1.5`
Bond order of \[\ce{O^{+}2}\]:
Electronic configuration:
`σ1s^2, σ^∗1s^2, σ2s^2, σ^∗2s^2, σ2p_z^2 (π2p_x^2 = 2p_y^2)(π^∗2p_x^1 = π^∗2p_y^0)`
BO = `1/2(10 - 5) = 5/2 = 2.5`
Bond order of \[\ce{O2}\]:
Electronic configuration:
`σ1s^2, σ^∗1s^2, σ2s^2, σ^∗2s^2, σ2p_z^2 (π2p_x^2 = 2p_y^2)(π^∗2p_x^1 = π^∗2p_y^1)`
BO = `(10 - 6)/2 = 4/2 = 2`
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(i) \[\ce{CN-}\]
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(iv) \[\ce{O^{2-}2}\]
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(i) \[\ce{N2 -> N^{+}2 + e-}\]
(ii) \[\ce{O2 -> O^{+}2 + e-}\]
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| Column I | Column II |
| (i) \[\ce{NO}\] | (a) 1.5 |
| (ii) \[\ce{CO}\] | (b) 2.0 |
| (iii) \[\ce{O^{-}2}\] | (c) 2.5 |
| (iv) \[\ce{O2}\] | (d) 3.0 |
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