How is nitrogen prepared from liquid air?

Give two uses of nitrogen.

How is ammonia prepared in the lab?

Give two uses of nitric acid.

What is phosphorescence?

What is the reaction of Phosphorous with alkali?

Discuss the oxidising power of fluorine.

Elements of group 16 show lower value of first ionization enthalpy compared to group 15, why?

Although \(\triangle\)H of fluorine is less negative than that of chlorine, but fluorine is a stronger oxidising agent than chlorine, why?

(i) Give correct order of boiling point of hydride of group 17.
(ii) Fluorine exhibits only -1 oxidation state whereas other halogens show +1, +3, +5 and +7 oxidation state also Explain.

How would you account for the following? The electron gain enthalpy with negative sign is less for oxygen than that of sulphur.

There is a huge difference between the melting and boiling points of oxygen and sulphur. Why?

Why does ozone act as a powerful oxidising agent?

How is SO₂ an air pollutant?

Acidic character increases from HF to HI. State whether the above statement is True or false and give reason for your answer.