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NTA Abhyas JEE Main2020Chemistryp Block Elements (Group 15, 16, 17 & 18)Practice

A gaseous compound of nitrogen and oxygen is paramagnetic in nature. When it is cooled below 0 ° C its molecular mass increases and paramagnetism is lost. The behaviour is reversed on heating. The compound is

Options

  1. AN 2 O 3
  2. BN 2 O
  3. CN O 2
  4. DN 2 O 4

Correct answer

C. N O 2

Step-by-step solution

N O 2 is paramagnetic because of unpaired electron. On cooling N O 2 below 0 ° C , it dimerises to N 2 O 4 which does not have any unpaired electrons. Hence, no paramagnetism is show by the dimer, N 2 O 4 .

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