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B
Substance containing NO+ is said to be acid and that containing NO−3 is said to be base
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C
N2O4 is paramagnetic
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D
NO2 dimerises to N2O4 with disappearance in paramagnetism
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Solution
The correct option is CN2O4 is paramagnetic NO2 has one unpaired electron and because of that it is paramagnetic but N2O4 is diamagnetic as it is forms by dimerizatin of NO2.