Before reduction, the ore is first converted into the oxide of metal of interest. Give reason

How is aluminum chloride prepared from aluminum?

Why do noble gases form compounds with fluorine and oxygen only?

What are the general properties of f-block elements? (Lanthanides and Actinides)
(i) Electronic configuration
(ii) Oxidation state
(iii) Radii of tripositive ions.

Aqueous copper sulphate solution (blue) gives
(i) a green precipitate with aqueous potassium fluoride.
(ii) a bright green solution with aqueous potassium chloride. Explain these experimental results.

If NaCI is doped with 10^-3 mol % of SrCl₂ What is the concentration of cation valencies?

A reaction is of second order in A and first order in B.
(i) Write the differential rate equation. 
(ii) How is the rate affected on increasing the concentration of A three times?
(iii) How is the rate affected when the concentration of both A and B is doubled?

Define buffer Index

Define equivalent conductance.

What are the advantages of Brownian movement?