• Skip to main content
  • Skip to primary sidebar
  • Skip to footer
  • NCERT Solutions
    • NCERT Books Free Download
  • TS Grewal
    • TS Grewal Class 12 Accountancy Solutions
    • TS Grewal Class 11 Accountancy Solutions
  • CBSE Sample Papers
  • NCERT Exemplar Problems
  • English Grammar
  • MCQ Questions

CBSE Tuts

CBSE Maths notes, CBSE physics notes, CBSE chemistry notes

Using the MO diagram of NO, calculate the bond order. Compare it to NO^+?

Using the MO diagram of \(NO,\) calculate the bond order. Compare it to \(\mathrm{NO}^{+} ?\)

Answer:
The MO diagram for \(NO\) is as follows (Miessler et al., Answer Key):
Using the MO diagram of NO, calculate the bond order. Compare it to NO^+ Img 1
(The original was this; I added the orbital depictions and symmetry labels. For further discussion on the orbital energy ordering being \(\mathrm{N}_{2}\)-like, see here and comments.)

Quick overview of what the labels correspond to what MOs:

  • \(1 a_{1}\) is the \(\sigma_{2 s}\) bonding MO.
  • \(2 a_{1}\) is the \(\sigma_{2 s}^{*}\) antibonding MO.
  • \(1 b_{1}\) is the \(\pi_{2 p_{x}}\) bonding MO.
  • \(1 b_{2}\) is the \(\pi_{2 p_{y}}\) bonding MO.
  • \(3 a_{1}\) is the \(\sigma_{2 p_{z}}\) bonding MO, but it’s relatively nonbonding with respect to oxygen.
  • \(2 b_{1}\) is the \(\pi_{2 p_{x}}^{*}\) antibonding MO.
  • \(2 b_{2}\) is the \(\pi_{2 p_{x}}^{*}\) antibonding MO.
  • \(4 a_{1}\) is the \(\pi_{2 p_{x}}^{*}\) antibonding MO.

To obtain the bond order, look at the molecular orbitals formed and decide whether they are bonding or antibonding.

\(\mathrm{BO}=\frac{1}{2}\left(\text { bonding } \mathrm{e}^{-}-\text {antibonding } \mathrm{e}^{-}\right)\)
\(=\frac{1}{2}[(2+2+2+2)-(2+1)]\)
\(=2.5\)

And this should make sense because \(\mathrm{NO}^{+}\) is isoelectronic with \(CO\) which has a bond order of \(3\). With one additional electron in an antibonding \(\left(2 b_{2}\right)\), orbital the bond order decreases by \(\frac{1}{2}\) relative to \(\mathrm{NO}^{+}.\)

If paramagnetism occurs due to unpaired electrons, is \(NO\) paramagnetic or diamagnetic?

Primary Sidebar

NCERT Exemplar problems With Solutions CBSE Previous Year Questions with Solutoins CBSE Sample Papers

Recent Posts

  • MCQ Questions with Answers for Class 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, and 1 all Subjects
  • Angle, Types of Angles
  • AND gate is formed by using two? 1)OR 2)NAND 3)NOT 4)NOR
  • And expression for one minus the quotient of one and a number X?
  • What is average human body temperature in Kelvins?
  • How many moles of caffeine are in a cup, and how many molecules of caffeine?
  • How far will the car have traveled in that time?
  • What is its atomic number?
  • How many neutrons does it have?
  • An atom loses electrons to form what?
  • What is the atomic number of this atom?
  • Which one of these is the answer?
  • What is its concentration?
  • Can an equilateral triangle also be isosceles?
  • What is the charge of an alpha particle?

Footer

Maths NCERT Solutions

NCERT Solutions for Class 12 Maths
NCERT Solutions for Class 11 Maths
NCERT Solutions for Class 10 Maths
NCERT Solutions for Class 9 Maths
NCERT Solutions for Class 8 Maths
NCERT Solutions for Class 7 Maths
NCERT Solutions for Class 6 Maths

SCIENCE NCERT SOLUTIONS

NCERT Solutions for Class 12 Physics
NCERT Solutions for Class 12 Chemistry
NCERT Solutions for Class 11 Physics
NCERT Solutions for Class 11 Chemistry
NCERT Solutions for Class 10 Science
NCERT Solutions for Class 9 Science
NCERT Solutions for Class 7 Science
MCQ Questions NCERT Solutions
CBSE Sample Papers
cbse ncert
NCERT Exemplar Solutions LCM and GCF Calculator
TS Grewal Accountancy Class 12 Solutions
TS Grewal Accountancy Class 11 Solutions