Nitrogen Compounds

Question 1

Commercial prep of N2
Lab prep of N2
Thermal decomposition
Pure nitrogen

What are the impurities that will be formed in the 3rd reaction?
How can it be removed?

Answer 1

Liquefaction and fractional distillation of air
NH4Cl + NaNO3 –> N2 + 2H2O + NaCl.
(NH4)2Cr2O7 –> N2 + H2O + Cr2O3
Thermal decomposition of Barium nitride gives barium + N2

NO and HNO3
By passing the gas through aq H2SO4 with potassium dichromate

Question 2

N2
Colour, odour, taste, toxicity
Isotopes
Solubility in water
Freezing point and boiling point
N2 is inert. Why?

Answer 2

Colourless, odourless, tasteless, non toxic
N14 and N 15
Low
Low
High bond enthalpy

Question 3

Reactivity of N2 wrt to high temp
N2 + O2 at very high temp?
Use of liq N2

Answer 3

Increases rapidly with high temperature
Gives NO
Refrigerant to preserve biological materials, food items and in cryosurgery.

Question 4

Natural prep of ammonia
Colour, Odour
Reason for high MP and BP
Solubility in h2o

Answer 4

Decomposition of urea
Colourless, pungent
Hydrogen bonding
Highly soluble. Sol slightly basic (formation of OH-)

Question 5

Reaction, acidity and colour
N2O
NO
N2O3
NO2
N2O4
N2O5

Answer 5

NH3NO3 –> N2O +H2O
Colourless, neutral
NaNO2 + FeSO4 + H2SO4
Colourless neutral
NO + N2O4
Blue , acidic
PbNO3
Brown , acidic
2NO2
Colourless, acidic
HNO3 + P4O10
Colourless , acidic

Question 6

Odd electron species among oxides of N
Gases among oxides of N

Answer 6

NO and NO2
N2O, NO and NO2

Question 7

HNO3

Colour, str in gaseous state
Strong RA/OA
Attacks all metals except?
Dil and Conc HNO3 with Cu
Dil and Conc HNO3 with Zn
Which metals form passive oxide film?
HNO3 + Iodine
+ Carbon
+ phosphorus acid?
Brown ring Fe OS

Answer 7

Colourless, planar
OA
Noble mets such as Ag and Pt
NO, NO2
N2O, NO2
Cu, Al
Iodic acid
CO2
Phosphoric acl
[Fe(H2O5) (NO) ]2+ –> +1