Question

A metal 'A' when reacts with nitric acid produces brown fumes 'B' and blue coloured solution'C' .
Identify A,B,C​

Answer 1

Answer:

Nitric acid reacts with copper according to the reaction: 4 HNO3(l) + Cu(s) ==> Cu(NO3)2(s and aq) + 2 NO2(g) + 2 H2O(l) The copper nitrate salt that forms is a deep blue color. The nitrogen dioxide is a maroon vapor.Reacting iron powder with dilute nitric acid will produce Iron III Nitrate, nitrous oxide & water (the nitric acid oxidising the iron to the Fe3+ cation). The reaction proceeds slowly.

Explanation:

Copper reacts with cold and dilute nitric acid to yield copper nitrate, water and nitric oxide. The formed nitric oxide combines with the oxygen of air to give brown fumes of NoN.Some precious metals, such as pure gold and platinum-group metals do not react with nitric acid, though pure gold does react with aqua regia, a mixture of concentrated nitric acid and hydrochloric acid.Hydrogen gas is not evolved when a metal reacts with nitric acid. It is because HNO3 is a strong oxidising agent. It oxidises the H2 produced to water and itself gets reduced to any of the nitrogen oxides (N2O, NO, NO2).With dilute acid one of the principal products is nitrogen monoxide, while with concentrated acid it is nitrogen dioxide. Magnesium reacts with dilute nitric acid forms magnesium nitrate and hydrogen gas. Nitric acid has no action on gold, platinum, iridium, tantalum, rhodium, and titanium