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Q.

Four diatomic species are listed below in different sequences. Which of these represents the correct order of their increasing bond order ?

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a

C_2^{2 - }\; < \;He_2^{ + \;}\; < \;NO\; < \;O_2^ -

b

He_2^ + \; < \;O_2^{ - \;}\; < \;NO\; < \;C_2^{2 - }

c

O_2^ - \; < \;NO\; < \;C_2^{2 - }\; < \;He_2^ +

d

NO\; < \;C_2^{2 - }\; < \;O_2^ - \; < \;He_2^ +

answer is B.

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Detailed Solution

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\large \begin{array}{*{20}{c}} {Molecule\;(or)\;ion}&{He_2^ + }&{O_2^ - }&{NO}&{C_2^{ - 2}} \\ {{e^{ - s}}}&3&{17}&{15}&{14} \\ {B.O}&{0.5}&{1.5}&{2.5}&3 \end{array}

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