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Question

Given below a statement (S) and explanation (E) is given. Choose the appropriate answer:

Statement (S): O2 is diamagnetic

Explanation (E): O2 has two electrons in anti-bonding π orbitals.


A

S is correct but E is wrong

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B

S is wrong but E correct

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C

Both S and E are correct and E is correct explanation of S

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D

Both S and E are correct but E is not correct explanation of S

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Solution

The correct option is B

S is wrong but E correct


Now, here our first step is to check whether statement 1 and is right.

So, let's draw MOT energy level diagram for oxygen molecule.

Eelctronic configuration of O2 is:

O2 (σ1s)2 (σ1s)2 (σ2s)2 (σ2s)2 (σ2pz)2 (π2px2π2py2) (π2px2π2py2)

Therefore, we have two unpaired electrons in π2px and π2py, therefore it will be PARAMAGNATIC.

STATEMENT I is wrong

Now,

STATEMENT II is right.

Because O2 has two electrons in anti-bonding π orbitals


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