Which of the following statements is not corr | vedclass

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(B) Bond order $= \frac{1}{2} [	ext{Number of bonding electrons} - 	ext{Number of antibonding electrons}]$.$I$) Bond order of $H_2^- = \frac{1}{2}[2

Vedclass · Accepted Answer

$I$ and $IV$

Vedclass · Answer

(B) Bond order $= \frac{1}{2} [	ext{Number of bonding electrons} - 	ext{Number of antibonding electrons}]$.$I$) Bond order of $H_2^- = \frac{1}{2}[2-1] = 0.5$. Bond order of $H_2^+ = \frac{1}{2}[1-0] = 0.5$. Bond order of $H_2 = \frac{1}{2}[2-0] = 1$. Since bond length is inversely proportional to bond order,the order is $H_2^- = H_2^+ > H_2$. This statement is correct.$II$) Bond order of $O_2^+ = \frac{1}{2}[10-5] = 2.5$. Bond order of $NO = \frac{1}{2}[10-5] = 2.5$. Bond order of $N_2^- = \frac{1}{2}[10-5] = 2.5$. This statement is correct.$III$) Bond order can be zero,but it cannot be four for stable molecules in standard conditions. This statement is incorrect.$IV$) $NO_3^-$ has a bond order of $1.33$ for $N-O$ bonds,while $BO_3^{3-}$ has a bond order of $1$ for $B-O$ bonds. This statement is incorrect.

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