what is observed when rust is added to dilute nitric acid
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The reaction of dilute nitric acid with copper produces NO, while more reactive metals, such as zinc and iron, react with dilute nitric acid to yield N2O. When extremely dilute nitric acid is used, either nitrogen gas or the ammonium ion (NH4+) may be formed.
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In each case hydrogen gas is produced as well as the metal salt. The reaction between iron and nitric acid eventually produces a red-brown rust colour (iron(III) oxide). ... Tin and copper do not react with the hydrochloric and sulphuric acids but a few bubbles may be seen (using the magnifying glass) with the nitric acid.
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