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The bond order in O₂^2- species is

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answer is A.

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Detailed Solution

large {O_2};;underrightarrow { + {e^ - }};{O_2}^ -;; underrightarrow { + {e^ - }};{O_2}^{ - 2}

Electrons	8	9	10	11	12	13	14	15	16	17	18	19	20
B.O	0	0.5	1.0	1.5	2.0	2.5	3.0	2.5	2.0	1.5	1.0	0.5	0
Magnetic properties	D	P	P	P	D	P	D	P	P	P	D	P	P

From 14 to 20 electrons each time the electron enters into ABMO's. Therefore B.O decreases by 0.5 units for each e^- entry.

Where as from 8 to 14each time electron enters into BMO's ,therefore B.O increasesby 0.5 units for each electron entry.

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