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Question

The most acidic oxide among the following is


A

N2O5

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B

P2O5

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C

NO2

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D

N2O4

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Solution

The correct option is A

N2O5


Explanation for correct option:

A. N2O5

Non-metallic oxide:

  • Non-metallic oxides are formed when a non-metal reacts with oxygen gas.
  • A non-metallic oxide is acidic in nature.
  • General reaction for the formation of non-metallic oxide:

Non-metal+OxygenNon-metallicoxide

Acidic oxides of Nitrogen:

  • Dinitrogen Pentoxide is the most acidic oxide than nitrogen dioxide and Nitrogen tetraoxide as the oxides in the higher oxidation state of an element are more acidic than that of the lower oxidation state. Thus, N2O5 is the most acidic oxide.

Explanation for incorrect options:

B. Phosphorus lies below Nitrogen in Group-15. As the nature of the acidic oxide decreases down the group. Thus, P2O5 is less acidic oxide than N2O5.

C. In Nitrogen dioxide NO2, Nitrogen exits in +4 oxidation state. Thus, it will be less acidic in nature than N2O5.

D. In Nitrogen tetraoxide N2O4, Nitrogen exits in +4 oxidation state. Thus, it will be less acidic in nature than N2O5.

Hence, the correct option is A i.e. N2O5.


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