Which is the element present in group 15 of periodic table showing oxidation state from -3 to +5?

How ammonia is prepared in laboratory? What is the chemical change happening when ammonium hydroxide solution is added drop wise to excess into a copper sulphate solution? (Give equations wherever necessary.)

phosphorous is the second element in the 15 th group of the periodic table.

1. Which are the two important halides of phosphorous?

2. How they are prepared?

3. Explain with equations, their action with moisture.

An oxide of nitrogen which is brown in color and paramagnetic, on cooling becomes another oxide which is diamagnetic liquid or solid. Identify the two oxides and write the equation showing the change.

Why the first element in groups 15, 16, 17 and 18 of the periodic table show abnormal properties compared to rest of the members?

Deacon’s process is used for the manufacture of ------------ .

Name the process used for the large scale preparation of Nitric acid.

Name the compound of phosphorus which is used in Holme’s signal.

The strongest hydrohalic acid is -----------

Name the important oxoacids of nitrogen and write their chemical formulae.

Nitrogen does not form pentahalides. Why?

Why dintrogen (N₂ ) is inert at room temperatuer?

Expain the manufacture of ammonia?

Write a method to prepare very pure nitrogen (N₂) in the laboratory

Thermal stability of hydrides of  group 15 elements decreases from NH₃ to BiH₃ . Why ?

Write three anomolous properties of nitrogen compared to other elements of group 15

In group 15 stability of +5 oxidation state decreases down the group. Give reason

In group 15 stability of +5 oxidation state decreases down the group. Give reason

First ionisation enthalpy of Nitrogen is higher than Oxygen. Why?

Which allotropic form of phosphorous is more reactive?

What are the products obtained by the thermal decomposition of sodium azide.