JEE Main 2020ChemistryChemical Bonding and Molecular StructureMediumMCQ

JEE Main 2020 — Chemical Bonding and Molecular Structure Question with Solution

JEE Main 2020 (07 Jan Shift 2)

Question

The bond order and the magnetic characteristic of CN- are

Choose an option

Show full solutionCorrect option: B
Correct answer
B3, diamagnetic

Step-by-step explanation

According to MOT (If z is internuclear axis) The configuration of

CN−:σ1s2,σ*1s2,σ2s2,σ*2s2,π2px2=π2py2,σ2pz2
 
Bond order=number of electrons in bonding orbitals-number of electrons in anti-bonding orbitals2

Bond order = 1 2 (10−4)=3

CN − is diamagnetic due to absence of unpaired electron.

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About this question

This is a previous-year question from JEE Main 2020, covering the Chemical Bonding and Molecular Structure chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.