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Which of the following arrangements shows the decreasing order of acidic nature?

1. N2O5 > SO3 > CO2 > CO
2. N2O5 > SO2 > CO2 > CO
3. SO3 > CO2 > CO > N2O5
4. SO2 > N2O5 > CO > CO2

Correct answer: N2O5 > SO3 > CO2 > CO

Solution

The correct option reflects the trend in acidic strength based on the oxides' ability to donate protons; N2O5 is a strong acid due to its high oxidation state and ability to form strong acids in solution, followed by SO3, which is also a strong acid, while CO2 and CO are weaker due to their lower oxidation states and less acidic behavior.

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