Question

A brown gas is obtained when metals are reduced by nitric acid ?
(a) N2O
(b) N2O3
(c) NO2
(d) NO

Answer 1

Copper and Nitric Acid. When concentrated nitric acid is dropped on a copper disk in the bottom of a glass cylinder, a reddish-brown cloud of nitrogen dioxide gas is rapidly evolve

Answer 2

Nitrogen Dioxide is obtained when metals are reduced by nitric acid

• Let us take the example of the reaction of copper metal with nitric acid
• Cu + 4 H⁺ → Cu²⁺ + NO₂ + 2H₂O
• NO₂ has a reddish-brown color and is extremely toxic.
• It irritates the eyes.
• It has a biting odor and is an air pollutant.
• It is an intermediate in the synthesis of nitric acid.
• It is used in the synthesis of fertilizers.
• #SPJ3