Which of the following is paramagnetic ? from Chemistry Chemical

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561.

Which of the following is paramagnetic ?

  • N2

  • C2

  • N2+

  • O22-


C.

N2+

C2 ➔ the molecular orbital configuration (12) is

➔ C2 = [(σ1s)2 (σ*1s)2 (σ2s)2 (σ*2s)2 (π2py)2 (π2pz)2]

C2 molecule is diamagnetic as it does not contain any unpaired electron

N2 ➔ the molecular orbital configuration (14) is

 ➔ N2 = [(σ1s)2 (σ*1s)2 (σ2s)2 (σ*2s)2 (π2py)2 (π2pz)2 (σ2px)2]

N2 molecule is diamagnetic because it does not contain any unpaired electron .

N2+ ➔ the molecular orbital configuration (13) is

➔ N2+ = [(σ1s)2 (σ*1s)2 (σ2s)2 (σ*2s)2 (π2py)2 (π2pz)2 (σ2px)1]

N2+ molecule is paramagnetic because it contain one unpaired electron .

O22- ➔ the molecular orbital configuration (18) is

➔ O22- = [(σ1s)2 (σ*1s)2 (σ2s)2 (σ*2s)2 (σ2px)2 (π2py)2 (π2pz)2 (π*2py)2 (π*2pz)2]

It does not contain any unpaired electron so , it is diamagnetic .


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562.

Assertion : SeCl4 does not have a tetrahedral structure.

Reason : Se in SeCl4 has two lone pairs.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


563.

Intermolecular hydrogen bonding is strongest in :

  • C2H5OH

  • HF

  • H2O

  • CH3COCH3


564.

Hybridization present in ClF3 is :

  • sp2

  • sp3

  • dsp2

  • sp3d


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565.

Number of electrons surrounding Kr in KrF2 is :

  • 10

  • 6

  • 4

  • 8


566.

H - I - O bond angle in H2O2 :

  • 90o

  • 180o

  • 109.5o

  • 94.8o


567.

Assertion : Molecular nitrogen is less reactive than molecular oxygen.

Reason : The bond length of N2 is shorter than that of oxygen.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


568.

Electron deficient molecule is :

  • CCl4

  • PCl5

  • BF3

  • SF6


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569.

Number of unpaired electrons in O2 molecule is :

  • zero

  • one

  • two

  • four


570.

Bond order in benzene is :

  • 1

  • 2

  • 1.5

  • none of these


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