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Which of the following statements are correct ? `(i)` Amongs `O_(2),O_(2)^(+),O_(2)^(-)` and `O_(2)^(2-),O_(2)^(+)` has the greatest stability. `(ii)` Double bond in `C_(2)` consists of both Pi `(pi)` bonds because of the presence of four electrons in two pi molecule orbitals. `(iii)` Amongst `B_(2),C_(2),N_(2)` and `O_(2)`, mixing of `2s-2p` orbitals takes palace only in `N_(2)` molecule. `(iv)` Isoelectronic molecules and ions have identical bond order.A. `(i)` and `(ii)` onlyB. `(ii)` and `(ii)` onlyC. `(i)` and `(iii)` onlyD. `(i),(ii)` and `(iv)` only |
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Answer» Correct Answer - 4 `(i)O_(2)=(10-6)/(2)=2," "O_(2)^(+)=(10-5)/(2)=2.5` `O_(2)^(-)=(10-7)/(2)=1.5," "O_(2)^(2-)=(10-8)/(2)=1` Bond strength `prop` Bond order `(ii) sigma1s^(2)sigma^(**)1s^(2)sigma 2s^(2) sigma^(**)2s^(2)pi 2px^(2)=pi 2p y^(2)," "Cunderset(pi)overset(pi)(=)C` `(iii)` Mixing of `2s-2p` orbitals takes place in `N_(2),B_(2)` and `C_(2)` molecules. No mixing os `2s-2p` orbitals occurs in `O_(2)` molecules. `(iv)` `N_(2),CO` and `NO^(+)` having 14 electrons possess bond order 3. |
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