Explain the principle of electrolytic refining with an example.

Give the limitations of Ellingham diagram.

Write a note on zeolites.

What happens when PCl₅ is heated?

What type of hybridisation occur in
a) BrF₅
b) BrF₃

Describe the variable oxidation state of 3d series elements.

What are the limitations of VB theory?

What is meant by the term “coordination number”? What is the coordination number of atoms in a bcc structure?

The time for half change in a first order decomposition of a substance A is 60 seconds. Calculate the rate constant. How much of A will be left after 180 seconds?

From the following data, show that the decomposition of hydrogen peroxide is a reaction of the first order:

t(min)	0	10	20
V(ml)	46.1	29.8	19.3

Where t is the time in minutes and V is the volume of standard KMnO₄ solution required for titrating the same volume of the reaction mixture.