help with chem/nitrogen?

Question

1: What is pure Nitrogen obtained from?
It is obtained from ammonium nitrite, NH4NO2
It is obtained from air.
It is obtained from Earth
It is obtained from the Fungus.


2: The brown gas produced when copper reacts witt concentrated nitric acid is
N2O
NO
NO2
N2O3


3: The atomic weight of nitrogen is
14
28
16
36


4: A retort is generally used in preparing
carbonic acid
nitric acid
hypochlorous acid
sulfuric acid


5: The gas obtained when copper unites with dilute nitric acid is
hydrogen
nitric oxide
nitrogen
nitrogen peroxide


6: A gas that is less dense than air is
H2S
NH3
NO2
O2


7: Unstable compounds used as explosives usually con­tain the element
chlorine
nitrogen
phosphorus
sulfur


8: Nitric acid may be prepared by the reaction be­tween
H2SO4 and NaNO3
NaNO3 and KOH
H2S and NH3
H2SO4 and KNO3

Answer 1

1. From air
2. NO2
3.14
5.Nitric oxide
6.NO2
7.Nitrogen
8.H2so4 AND NaNO3

Answer 2

1) nitrogen obtained from air
2) do not know
3) 14
4) do not know
5) hydrogen
6)NH3
7) Nitrogen example nitroglycerin
8) do not know