Which of the following is a wrong order with respect to the property mentioned against each option?

N O^{-} > N O > N O^{+}

: bond length

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H_{2} > H_{2}^{+} > H e_{2}

: bond energy

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O_{2}^{2 -} > O_{2} > O_{2}^{2 +}

: paramagnetic moment

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N O_{2}^{+} > N O_{2} > N O_{2}^{-}

: bond angle

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Solution

The correct option is C $O_{2}^{2 -} > O_{2} > O_{2}^{2 +}$ : paramagnetic moment
(A) ${N O}^{-}$ > $N O$ > ${N O}^{+}$ - correct sequence
Bond length $\propto$ $\frac{1}{B o n d o r d e r}$
(i) ${N O}^{-}$ has a Bond order of $\to$ $\frac{10 - 6}{2} = 2$
(ii) $N O$ has Bond order of $\to$ $\frac{10 - 5}{2} = 2.5$
(iii) ${N O}^{+}$ has Bond order of $\to$ $\frac{10 - 4}{2} = 3$

(B) $H_{2}$ > $H_{2}^{+}$ > ${H e}_{2}^{+}$ - correct sequence Bond Energy $\propto$ Bond order
Bond order of $H_{2}$ = $\frac{2 - 0}{2} = 1$
Bond order of $H_{2}^{+}$ = $\frac{1 - 0}{2} = 0.5$
Bond order of ${H e}_{2}$ = $\frac{2 - 2}{2} = 0$
Paramagnetism: determined by the no. of unpaired electrons in the molecular orbital.
$O_{2}^{2 -}$ = No unpaired electrons- Diamagnetic
$O_{2}$ = 2 unpaired electrons in $π$ 2py and $π$ 2pz respectively - Para magnetic
$O_{2}^{2 +}$ = No unpaired electron - Diamagnetic
Hence Only $O_{2}$ is $P a r a m a g n e t i c$
${N O}_{2}^{+}$ > ${N O}_{2}$ > ${N O}_{2}^{-}$ - is in correct sequence
${N O}_{2}^{+}$ should have greater bond angle than ${N O}_{2}^{-}$ since in ${N O}_{2}^{+}$ there are only 2 bonds and no lone pairs available, so bond angle becomes 180degree.

Option C is incorrect. Hence, option C is the answer.

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Similar questions

Among the following the total no. of species which are paramagnetic

$O_{2}, S_{2}, C N^{-}, N O^{+}, O_{2}^{2 +}, O_{2}^{2 -}, B_{2}, N_{2}^{2 -}, O_{2}^{+}, N O, N O_{2}, N_{2} O$ ___

Calculate the total number of molecules that will possess fractional bond order among the following molecules
$O_{2}^{2 +}, N_{2}^{2 +}, O_{2}^{+}, N O, C O, C O^{+}, O_{2}^{-}, N O^{2 +}, C N^{-}, N O^{2 -}, N_{2}^{-}$

Q. Number of paramagnetic molecules from the following are:

C N^{-}, N O, O_{2}^{2 -}, O_{2}, N O_{2}, O_{2}^{-}, B_{2}, C_{2}, F_{2}^{-}

Q. Out of

N O, N O^{+}, O_{2}, N O^{-}, O_{2}^{+}

, select species with same bond-order and paramagnetic.

Question 23

Which of the following have identical bond order?

(a) $C N^{-}$

(b) $N O^{+}$

(d) $O_{2}^{2 -}$

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