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Doctors Medicines MCQs Q&A

Concentrated nitric acid, upon long standing, turns yellow brown due to the formation of
(a) NO (b) NO2 (c) N2O (d) N2O4

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(b) The slow decomposition of HNO3 is represented by the eqn.

 4HNO3 → 4NO2 + 2H2O + O2                                                                                                                                              (yellow-brown)

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