What does this reagents detect

Question

1. CuSO4 solution for liquid

2. nessler reagent for gas

What colour will it changes to if there is a presents of that elements?

Answer 1

1.In Fehling solution it detects presence of carbohydrates.In presence of it copper sulfate turns deep blue.

2. Nessler reagent is used to test the persence of NH3.It gives marron or brown colour.