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Question

Which among the following is a colorless paramagnetic gas?


A

Nitric oxide

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B

Nitrous oxide

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C

Nitrogen oxide

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D

Dinitrogen trioxide

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Solution

The correct option is C

Nitrogen oxide


The explanation for the correct option

(A) and (C) Nitric oxide or nitrogen oxide

Paramagnetic nature

  • The presence of unpaired electrons in the molecular orbital indicates the compound's paramagnetic nature. The oxide's color is a result of its paramagnetic properties.
  • NO is named nitric oxide or nitrogen oxide. Nitrous oxide is also known as laughing gas or nitrous.
  • The molecular orbital configuration of NO is as follows:-
  • σ1s2σ*1s2σ(2s)2σ*2s2σ2pz2π2px2π2py2π*2px1
  • One unpaired electron is present. So, it is paramagnetic in nature.
  • It is a colorless gas with non-flammable properties.

The explanation for the incorrect option

  • Nitrous oxideN2O is a laughing gas, and it is diamagnetic in nature.
  • Dinitrogen trioxideN2O3 is diamagnetic. It is colored.
  • Hence, options (B), and (D) are incorrect.

Hence, option (A) is correct. Nitric oxide is a colorless paramagnetic gas.


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