Statement 1: The colour of an equilibrium mixture of NO 2 and N 2 O 4 becomes lighter when it is cooled. Statement 2: NO 2 is paramagnetic while N 2 O 4 is diamagnetic.

The forward reaction N 2 O 4 ⇌ 2NO 2 is endothermic Cooling shifts the equilibrium towards colourless N 2 O 4 , so the brown colour becomes lighter and Statement 1 is correct NO 2 has an unpaired electron and is paramagnetic, and N 2 O 4 has none and is diamagnetic, so Statement 2 is correct The magnetic property is unrelated to the shift with temperature, so Statement 2 does not explain Statement 1 Both are correct but II is not the explanation, option (b).

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Chemistry - Chemical Equilibrium Question with Solution | TestHub

ChemistryChemical EquilibriumMiscellaneous/MixedEasy2 minQB

ChemistryEasystatement

Statement 1: The colour of an equilibrium mixture of NO₂ and N₂O₄ becomes lighter when it is cooled.

Statement 2: NO₂ is paramagnetic while N₂O₄ is diamagnetic.

Options:

Answer:

Solution:

The forward reaction N₂O₄ ⇌ 2NO₂ is endothermic Cooling shifts the equilibrium towards colourless N₂O₄, so the brown colour becomes lighter and Statement 1 is correct

NO₂ has an unpaired electron and is paramagnetic, and N₂O₄ has none and is diamagnetic, so Statement 2 is correct

The magnetic property is unrelated to the shift with temperature, so Statement 2 does not explain Statement 1

Both are correct but II is not the explanation, option (b).

Stream:JEESubject:ChemistryTopic:Chemical EquilibriumSubtopic:Miscellaneous/Mixed

⏱ 2mℹ️ Source: QB

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