Question

The brown gas formed when HN03 is reduced by metal

Answer 1

Answer:

The copper reacts rapidly with the nitric acid. The solution turns blue-green and a brown gas is formed. The copper wire dissolves.

Answer 2

The brown gas formed when HNO_3 is reduced by metal to form nitrogen dioxide which is a poisonous brown gas with an irritating odour.

Explanation:

Suppose a metal Copper reacts with conc. HNO_3 the reaction will be written as-

$Cu+4HNO_3 →Cu(NO_3 )_2 +2NO_2 +2H_2O$

So, the orange or brown colored gas which is formed is Nitrogen dioxide or

$NO_2$

Hence ,

$HNO_3 \: is \: reduced \: by \: metal \: NO_2$

Project code#SPJ2