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Which of the following is a nitric acid anhydride?

1. NO
2. NO2
3. N2O5
4. N2O3

Correct answer: N2O5

Solution

Nitric acid (HNO3) is formed when N2O5 reacts with water, making N2O5 its anhydride. Anhydrides are compounds that form acids upon reaction with water.

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