Question

This flask originally held some copper wire and a clear solution of nitric acid. The two substances reacted and produced a brown gas and a blue solution. This reaction cannot be reversed. Evidence of a chemical reaction is shown by...

A) ice forming.
B) steam rising.
C) the formation of a gas.
D) a change in state from a solid to a liquid.
Is it "C?" I'm guessing that is the correct answer. If anybody can, please explain it to me so I won't have to ask again. Thank you.

Answer 1

yes it is c because When the copper wire is held in clear solution of nitric acid brown colored gas was released with change in color of the solution. Both these ... so it is c a formation of gas hope this helped