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Question

Which of the following reactions shows the acidic character of nitric acid?


  1. C+4HNO3CO2+2H2O+4NO2

  2. K2O+2HNO32KNO3+H2O

  3. S+6HNO3H2SO4+2H2O+6NO2

  4. ZnO+2HNO3Zn(NO3)2+H2O


Solution

The correct options are
B

K2O+2HNO32KNO3+H2O


D

ZnO+2HNO3Zn(NO3)2+H2O


In the given options,K2O and ZnO are basic oxides because they can give KOH and Zn(OH)2 when dissolved in water. So they act like bases. HNO3 being a strong acid readily forms salt and water in the reactions given below. Hence these reactions prove the acidic nature of nitric acid. 

K2O+2HNO32KNO3+H2O
ZnO+2HNO3Zn(NO3)2+2H2O

In the other two reactions, it shows the oxidising property of the acid.

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